(1) Dictyosoma elsa Strecker, Plate V, Fig. 14, 8. (The Elsa Sphinx.)

This peculiarly colored hawkmoth, which may easily be recognized by the figure in our plate, occurs in Arizona. A number of years ago Mr. Jacob Doll reared a large number of specimens from the larvæ. Since then but few specimens have been obtained, and it is as yet comparatively rare in collections.

Genus ATREIDES Holland

The generic name Atreus proposed by Grote and adopted on structural grounds by Rothschild & Jordan for this genus, having been preoccupied by Koch in the Arachnida, I have given the name Atreides to the genus, which contains the single species named originally Sphinx plebeja by Fabricius.

(1) Atreides plebeja Fabricius, Plate V, Fig. 6, 8. (The Plebeian Sphinx.)

This common species feeds in its larval state upon the trumpet-vine (Tecoma). It ranges from Canada to the Gulf States and westward to the Mississippi, wherever its foodplant is found. It is double-brooded in the Middle States, one brood appearing in June, the second in August.

Genus HYLOICUS Hübner

This genus, which includes some thirty species, most of which are found in America, though a few occur in Europe and Asia, is represented in our faunal limits by sixteen species, of which eleven are figured in our plates. It corresponds largely with the genus Sphinx as defined by many recent writers.

(1) Hyloicus eremitus Hübner, Plate VI, Fig. 6, 9. (The Hermit Sphinx.)

Syn., sordida Harris.

This hawkmoth, which is double-brooded, lives in the larval stage on spearmint (Mentha) and wild bergamot (Monarda). It ranges from New England southward to Georgia, and westward into the Mississippi Valley. It is not uncommon in western Pennsylvania, where it is double-brooded.

(2) Hyloicus eremitoides Strecker. (The Hermit-like Sphinx.)

Syn., lugens Grote (non Walker).

This species, which is allied to the preceding, may be easily recognized by its pale, silvery-gray color, by the almost entire absence of a dorsal stripe on the abdomen, and by the marking of the secondaries, which are grayish-white, having on the outer margin a broad band which is black inwardly, fading into darkish gray near the margin, a median irregularly curved black band, and at the insertion of the wing a black basal patch. The cut (Fig. 24) will enable the student to recognize the species, which is not common in collections. The insect is found in Kansas and the southwestern States.

(3) Hyloicus separatus Neumagen, Plate VI, Fig. 10, 8. (Neumogen's Sphinx.)

Syn. andromeda Boisduval (partim.); lugens Smith (partim.).

This species has been confounded with others, but may easily be recognized from the figure which we give in our plate. It ranges from Colorado southward through New Mexico and Arizona into Mexico.

(4) Hyloicus chersis Hübner, Plate I, Fig. 1, larva; Plate VII, Fig 8, 9. (The Chersis Sphinx.)

This common and widely distributed species ranges from Canada to Florida, westward to the Pacific, and southward into Mexico. Several local races are recognized, that which occurs upon the Pacific coast having been named oreodaphne by Henry Edwards. The caterpillar feeds upon the wild-cherry, the ash, the privet, and other allied plants. The insect is double-brooded in the Middle States, appearing on the wing in the latter part of May, and again in August.

(5) Hyloicus vancouverensis Edwards.

Syn. vashti Strecker.

Form albescens Tepper, Plate VI, Fig. 5, 8. (The Vancouver Sphinx.)

There are two forms of this hawkmoth, one, Hyloicus van

couverensis vancouverensis in which the middle of the thorax is pale gray, and the other, Hyloicus vancouverensis albescens, which has a very dark thorax, and which is figured on our plate. The moth is found from northern California to British Columbia, and eastward to Montana and Alberta.

(6) Hyloicus insolita Lintner, Plate V, Fig. 4, (Lintner's Sphinx.)

8.

This species, which is well represented on our plate, occurs in Texas. It is not common in collections. Rothschild & Jordan regard it as a form of H. libocedrus Henry Edwards, and apparently with reason.

(7) Hyloicus perelegans Henry Edwards. (The Elegant Sphinx.)

This hawkmoth may be distinguished by the even dark silvery-gray color of the fore wings, which are crossed by a distinct submarginal whitish band. The maculation recalls a dark chersis with the dark thorax and the body of H. drupiferarum. It is found on the Pacific coast.

(8) Hyloicus canadensis

Boisduval.

Syn. plota Strecker.

This species, which is not common, is represented by the accompanying cut (Fig. 25), drawn from a specimen in the Engel Collection in the Carnegie Museum, and taken in Massachusetts. It occurs in eastern Canada, northern New York, and New England.

(9) Hyloicus kalmiæ Abbot & Smith, Plate VI, Fig. 8, 9. (The Laurel Sphinx.)

This hawkmoth feeds in the larval stage upon Kalmia, ChiIt is not uncommon in the Middle onanthus, and Fraxinus. States of the Atlantic coast region, ranging from southern Canada to Georgia.

(10) Hyloicus gordius Cramer, Plate V, Fig. 13, 8. (The Gordian Sphinx.)

Syn. pacila Stephens.

The larva of this hawkmoth feeds upon various rosaceous plants, as the wild rose and the crab-apple. It ranges over the Atlantic region from southern Canada and New England to Georgia, and westward to Colorado.

(11) Hyloicus luscitiosa Clemens, Plate V, Fig. 1, 8. (Clemens' Hawkmoth.)

The caterpillar feeds upon various species of willow. The insect occurs from Canada to the Carolinas, and westward through the eastern portion of the valley of the Mississippi.

(12) Hyloicus drupiferarum Abbot & Smith, Plate VII, Fig. 7, 8. (The Wild-Cherry Sphinx.)

This common and easily recognizable species ranges over the whole of temperate North America from the Atlantic to the Pacific. The caterpillar feeds upon various trees and shrubs, but seems in the Middle Atlantic States to prefer the wild-cherry as a food-plant.

(13) Hyloicus dolli Neumægen.

Form coloradus Smith, Plate IV, Fig. 3, f. Sphinx.)

(The Colorado

Rothschild & Jordan recognize two forms of this species, H. dolli dolli Neumogen, and H. dolli coloradus Smith. The latter we figure. The former is prevalently lighter in color than the form coloradus. The insect ranges from Colorado to Arizona.

(14) Hyloicus sequoia Boisduval, Plate V, Fig. 8, 8. (The Sequoia Sphinx.)

Syn. coniferarum Walker (partim).

The early stages of this insect we do not remember to have seen described. It occurs on the Pacific coast. Boisduval's type was found sitting on the trunk of a red-wood tree (Sequoia). (15) Hyloicus pinastri Linnæus. (The Pine Sphinx.) Syn. saniptri Strecker.

The late Dr. Strecker reported this species as having been found by him in the vicinity of Reading, Pennsylvania, on one or two occasions. No one else has taken it, so far as is known. It is common in Europe, and has often been figured by European writers.

Besides the species above given, there are one or two other species of the genus found in our territory.