68 TRANS. ST. LOUIS ACAD. SCIENCE. 



the usual dark dot in the disk of tha 2d submarginal, which cloud exists in 

 5 also, but is not noticed from the rest of the wing being equally clouded. 

 Length $ .27 inch. Front wing o* .27 inch. 



One 6* , six ? . Say describes very briefly from a single $ , the 

 0* being unknown to him. The remarkable false suture on the 

 collare, which exists in the two preceding species, is not found 

 here. In my d 1 and one of my °. ? , the 2d recurrent vein coin- 

 cides with the 2d submarginal cross-vein. 



HylOtOIlia calcanea, Say ( = scafiularis, King, according to Norton), $. 

 — Blue-black. Head polished and glabrous. Clypeus emarginate in a very 

 obtuse angle, finely punctato-rugose. Labrum transverse and truncate at 

 tip. Palpi pale dusky or whitish. Antenna? black, almost f as long as the 

 body, finely rugose and scarcely pubescent. Thorax polished and glabrous, 

 pale rufous. Tegulze, metanotum including the basal plates, except some- 

 times a small whitish band between and behind the cenchri, lower surface 

 of the mesothorax up to the suture, and occasionally its entire pleura as well 

 as the humeral sutures and some clouds on the collare, and also the tip of 

 the scutel, all blue-black. Abdomen glabrous and polished, occasionally 

 coal-black above. Basal membrane whitish, sometimes pale dusky. Ovi- 

 positor luteous; its sheaths black. Legs blue-black; tarsi blackish ; the 

 basal I of the 1st joint of the hind tarsi, and sometimes the basal £ of joint 

 2 also, whitish. Wings clouded with fuliginous, darker along the costa 

 with some blue-black reflections, more hyaline towards the tip in the front 

 wings. Veins, costa and stigma black. Length $ .37-.40 (less than .35 

 Say) inch. Front wing o_ .37-. 40 inch. 



o" Differs from $ only as follows: — 1. The black color is but slightly 

 tinged with blue. 2. The antenna are fully f- as long as the body, the usual 

 hairs on the last joint nearly as long as the joint is wide. 3. The thorax, 

 including the basal plates, is entirely black, except the collare, which is ru- 

 fous ; 4. The legs are entirely black, except that in the front legs the knees, 

 tibia; and tarsi are anteriorly whitish, and sometimes in the hind legs the 

 whole of the tibite and all but the extreme tip of the two basal tarsal joints, 

 are whitish. 5. The wings are fuliginous, hyaline in the front wings beyond 

 the stigma and in the hind wings at the extreme tip. Length d 1 -25-.27 inch. 

 Front wing c? .25~.26 inch. 



Two d 1 , three ? . Say's description is very brief and imperfect, 

 and, though he evidently describes the $ only, he says nothing of 

 the sex. He describes the tarsi as "white or whitish at base," 

 whence it would be inferred that all six tarsi are so. In one wing 

 of one d 1 the 2d recurrent vein exactly coincides with the 2d sub- 

 marginal cross-vein and in the other wing almost so ; and in both 

 wings of one $ the 3d submarginal cross-vein bears a stump of a 



