776 Pomona College Journal of Entomology 



sensoria are well distributed on the articles as follows: III with from 1-i to 17, 

 IV with from 3 to 5, V with 1 to 3, VI with 1. The surface of the antenna; 

 are roughened by the large hair tubercles. Rostrum — Extending just beyond 

 the third coxa?, light amber near base and dark apical half. Frothorax — 

 Scarcely wider than the head and not as long, widest at the base, dark brown 

 with little powder. Meso- and Metathurax — Brown with black muscle lobes, 

 which are high and well developed, covered with ))luish powder, and with fine 

 silky hairs. (Tliese cover the entire body.) Front narrow and base nearly a.s 

 wide as abdomen. Abdomen — "Well rounded with abrupt posterior ending, 

 robust, bluish-gray with lilack spots set on dorsum in transverse and longitudi- 

 nal rows, ground color rich brown, the wliitish powder giving the grayish 

 appearance in the living specimens. On the lateral sides near the base are 

 irregular brownish patches, two of which form transverse bands which do not 

 quite reach across the abdomen. These are caused by the lack of powder in 

 the areas described, the ground color of the abdomen showing. The circular 

 black spots are slight depressions, velvety in appearance and arranged as fol- 

 lows: One spot just in front of each cornicle, a lateral longitudinal row on 

 each side consisting of five large spots and one small posterior spot, first two 

 anterior spots largest, a longitudinal row on each side just inside of the above- 

 named row consisting of five spots, the two spots near the median tubercle 

 the largest, two rows of small spots on the middle dorsum, two spots in each 

 row in front of the median tubercle and two behind. The most characteristic 

 thing about this species is the large dorsal tubercle, referred to above, which is 

 situated on the middle of the dorsum just in front of the cornicles. The base 

 of this dark tubercle is about as large as the base of one of the cornicles, and 

 from this wide base arises a sharp cone nearly as high as the distance across 

 the base. There are usually six small lateral tubercles on each side of the abdo- 

 men. The anal plate is well rounded, very dark brown and clothed with long 

 fine hair. The ventral surface of the abdomen is light brown with a row of 

 dark depressions near the lateral margins between each segment, covered with 

 fine white powder. Cornicles — (Figure B) short, wide at the base, with surface 

 concave to mouth, which is slightly flared, as shown in drawing, the diameter 

 of the base is a little more than three times that of the mouth, twice as wide 

 as long, very dark brown or black, covered with silky hairs; width of base 0.5 

 mm., length 0.25 mm. Ligs — Front and middle pair rather short, while the 

 hind pair are very long, hairy, amber brown throughout, with the apices of the 

 articles darker brown. Torsi— (Figure C) dark brown, article I about one- 

 fourth as long as article II, hairy. Claws slender and very sharp. ^Yings— 

 Large, hyaline. Primary — Length 5.5 mm., width near the tip of the second 

 discoidal 2 mm. Costal vein wide to stigma, rich brown. Subcostal twice as 

 wide as the costal, rich brown. Stigma narrow, about nine times as long as 

 wide, rich brown throughout, pointed from the base of the stigmal vein to the 

 tip. Stigmal vein arising near the tip of the stigma and extending nearly to 

 the furthest ti)) of the wing, almost straight \\\\\\ slight bend downward, yel- 

 low. First and second discoidals with bases close together and near the middle 



