OF WASHINGTON. 



313 



CHRYSALIS (Fig. 15, b, c). In size, general shape and arrangement of 

 the spines similar to that of yuccasella, but readily distinguished by the- 

 wing-sheaths in both sexes reaching only to the sixth abdominal joint and 

 tha posterior legs to the seventh, whereas in yuccasella the former reach 

 to the eighth and the latter to about the middle of the ninth. Themedio- 

 dorsal spines are also longer, more prong-like and less spatulate, while the 

 capitate spine is perhaps less prominent. The difference is more particu 

 larly noticeable in the greater length and prominence of the two spines on 

 the second abdominal joint. The anal joint in the male is narrower and 

 comparatively longer, and the two terminal teeth much shorter than in the 

 female, also not so well defined as in yuccasella. The anal segment in the 

 female is broader and stouter than in yuccasella, with the teeth shorter, 

 stouter and further apart, (c, d, e,f, g, k.} 



IMAGO (Fig. 16, ). Expanse 9' I 5~ 2 mm.; $, 16-18 mm. Body 

 flattened, piceous. Wings smoky-gray; the scales sparse and as easily 

 lost on the upper surface, especially of primaries, as in the Sesildse, so 



Fig. 16. Pronuba synthetica : a, 9 with wings expanded, hair-line 

 showing nat. size; 3, lateral view of the head and neck, more enlarged, 

 showing a purely lateral view of the trophi not in pairs to avoid confu 

 sion, the maxillary palpus (tnp) with its tentacle (*/); tongue (/); labial 

 palpus (//); base of antenna (/) ; eye (<?) ; front trochanter (f). 



