128 THE CANADIAN ENTOMOLOGIST. 



cheeks over one-third as wide as height of eyes. Antenn* black, five- 

 sixths as long as the face, the third joint five times as long as the second, 

 five times as long as broad ; arista thickened on the basal three-fourths, 

 the penultimate joint over twice as long as broad. Proboscis black, the 

 part beyond the basal articulation one-half longer than height of head, 

 slender, the labella scarcely thicker ; palpi yellow. Thorax and scutellum 

 black, grayish pollinose, the former bearing three post-sutural macrochaetse, 

 scutellum with two long pairs. Abdomen black, subshining, base of each 

 segment excepting the first narrowly gray pollinose ; second segment with 

 a marginal pair and a single lateral macrochaeta, the following each with 

 a marginal row of six. Legs black, claws and pulvilii very small. Wings 

 hyaline, base of third vein bristly, the others bare ; apical cell closed 

 slightly before the margin near the tip of the wing, hind cross-vein 

 straight, perpendicular, slightly nearer to the small cross-vein than to the 

 bend, the latter arcuate ; calypteres whitish. Length, 4 mm. Southern 

 California. A single specimen in February. 



Siphophyto opacus, n. sp. — $ Differs from the above description of 

 setiger only as follows : Second segment of abdomen destitute of a 

 marginal pair of macrochaetje. Third joint of antennae four times as long 

 as broad, penultimate joint of arista only one-half longer than broad. 

 Abdomen, except the first segment, wholly opaque gray pollinose, first 

 and second segments each with a lateral macrochaeta, the third with a 

 marginal row of six, the fourth with a similar row of eight. Length, 5 mm. 

 Southern California. A single specimen in April. 



NOTES ON THE THYATIRID^. 



BY HARRISON G. DYAR, A. M., NEW YORK. 



In describing the larval characters of this family (Proceedings of the 

 Boston Society of Natural History, 1894, p. 399), I followed the arrange- 

 ment of generic terms in Smith's list ; but I believe that it can be 

 improved. So I would arrange the genera of this neat little family as 

 follows (following Hampson) : — 

 Fore wing with a tuft of scales at internal angle. 



Fore vving not elongated ; outer margin rounded Habrosyne. 



Fore wing elongated \ outer margin subangulate Pseudothyatira. 



Fore wing without this tuft. 



Fore wing with vein 6 arising from angle of cell or below. 



Accessory cell reaching less than half way to apex Thyatira. 



Veins 7 to 9 long-stalked (accessory cell long) Euthyati7-a. 



Fore wing with vein 6 stalked ; colour gray Bombycia. 



