AQUATIC INSECTS IN THE ADIRONDACKS 577 



Head depressed, in outline conic as seen from above; mouth parts in- 

 serted in a rectangular notch at its anterior end, the hind margin of the 

 notch straight or nearly so ; from the hind angles of the buccal notch 

 there extends posteriorly on the top of the head a pair of grooves, parallel 

 or a little convergent for two thirds of their length, where connected by 

 a transverse groove, thereafter divergent toward the hind angles of the 

 head ; the depth of the buccal notch equals one fourth of the length of 

 the head ; the sides of the head are rugulose. The head bears setigerous 

 punctures as follows : a pair on the hind angles of the buccal notch, a 

 pair posterior to these between the grooves, a postocular pair, and a sub- 

 ocular pair, and two pairs still lower on the sides of the head. 



The anterior third of the thoracic segments (which become successively 

 wider from the front) is closely beset with whitish recurved hairs, which 

 disappear on the foremost abdominal segments ; there are a few long 

 straight hairs at the lateral margins of all the body segments excepting the 

 the last, which bears on its lateral margins a line of pubescence. Hairs 

 of caudal circlet plumose their whole length, yellowish with a blackish 

 tinge just beyond the base. 



This larva differs from that of Str. norma Wied. as figured and 

 described by Hart^ farther, in that the prothorax is longer than meso or 

 metathorax, the anal groove on the ventral side of the caudal segment is 

 closed and obsolete for the greater part of its length, only the T-shaped 

 anterior third of it remaining ; there are no paired markings beside it, and 

 there are no grooves on the ventral side of the two preceding segments. 



Stratiomyia seems to differ as a larva from O d o n t o m y i a, in 

 the squarely cut hinder margin of the buccal cleft, in the absence of ven- 

 tral hooks from the apices of the penultimate and antepenultimate seg- 

 ments as well as in the greater elongation of the last segment indicated 

 by Hart. 



A single larva was obtained from the surface of Little Clear creek back 

 of the hatchery building July 27, 1900. It was an old larva, perhaps in 

 transformation to puparium. A younger larva would probably have shown 

 something more of color pattern ; structural characters, however, should 

 be as described. 



During the last fortnight of our session a few specimens of a minute 

 soldier fly were picked from the hatchery ceiling, where at first they were 

 mistaken for S i m u 1 i u m, till a more careful glance discovered their 

 rotundity of outHnes. These proving to be new to science, D. W. Co- 

 quillett has, at our request, prepared the descriptions given on p. 585. 



Sepedon fuscipennis Loew 



Plate 14, fig. 1-8 



1859 Sepedon fuscipennis Loew, Wiener ent. monatschr. 3 : 299 

 1862 Sepedon fuscipennis Loew, Monographs Dipt. N. Am. 1 : 124 

 1878 S e p e d o n fuscipennis Osten-Sacken, Cat. Dipt. N. Am. p. 178 

 (listed) 



This species is reported in Osten-Sacken's catalogue from the middle 

 states. There are specimens of it in the Museum of comparative zoology 



^111. lab. nat. hist. Bui. 4:249-32, pi. 14, flg. 57. 



