79] LEPIDOPTEROUS LARVAE — FRACKER 79 



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

 peuellipse 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 taxonomic 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.) Solenohia 



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), Oiketicus 



The following species were studied : Solenohia ivalshella, Eurycit- 

 tarus confederata, Thyridopteryx ephemera eformis, and Oiketicus ah- 

 hotii. 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 Rockies but they 



