79] LEPIDOPTEROUS LARVAE— FRACKER 79 



4, 5, 6, and 10, the crochets arranged in the same uniordinal, lateral 

 penellipse on the anal as on the ventral pairs (Fig. 85). Spiracles ellip- 

 tical, the prothoracic pair much larger than those of the abdomen and 

 placed horizontally (Fig. 69). 



While the body setae offer some characters of taxonouiic importance 

 in separating the genera, I hesitate to use them on account of their great 

 reduction. In many cases it is impossible to find them without a pro- 

 longed search. This is not true, however, of the head setae, whose loca- 

 tion is distinct. The fact that their position varies with the different 

 genera is fortunate, for the coloration and general shape of the body are 

 too constant to aid in identification. 



In the following synopsis the division into Solenobiinae and Psy- 

 chinae is retained and some new facts are added to the characters Forbes 

 used in their separation. With one exception his larvae were of differ- 

 ent species from the ones mentioned below. 



Genera of Psychidae : 



a. Second adfrontal seta much farther dorsad than frontal seta, first 



adfrontal seta above level of top of front (Fig. 83) ; thoracic legs 



with last two segments very slender; alpha of abdomen above level 



of beta. (Solenobiinae.) Solenobia 



aa. Second adfrontal seta very close to frontal seta, first adfrontal seta 



below level of top of front (Figs. 76, 79, 82) ; thoracic legs with 



last two segments stout; alpha of abdomen below level of beta. 



( Psychinae. ) 



b. Margins of adfrontals meeting dorsad at an acute angle, adfrontals 



scarcely widened above first adfrontal seta (Fig. 76) ; larvae 



small, pale, not exceeding two centimeters in length. 



Eurycittarus 



bb. Margins of adfrontals meeting dorsad at a very obtuse angle or 



in a horizontal line; larvae three to five centimeters in length in 



last stage, usually dark in color. 



c. Frontal seta located below line connecting second adfrontal seta 



with frontal puncture (Fig. 78). Thyridopteryx 



cc. Frontal seta located above line connecting second adfrontal seta 



with frontal puncture (Fig. 82). Oiketieus 



The following species were studied: Solenobia walshella, Eurycit- 

 tarus confederata, Thyridopteryx ephemeraeformis, and Oiketieus ab- 

 botii. All are approximately unicolorous except for a tendency to lon- 

 gitudinal light and dark stripes on the thorax, especially on the dorsal 

 half. Two other species, Platoeceticus gloveri of Florida and Chalia 

 rileyi of the "Atlantic States" are found east of the Eockies but they 



