REPORT OF THE STATE ENTOMOLOGIST I91O 69 



fully 6 inches and an enormous miter-shaped head as long and 

 nearly as thick as its body. The subfamily Derbidae to which 

 Otiocerus is referable, is a group of moderate extent, comprising 

 some of the most beautiful and delicate forms found in the Hemip- 

 tera. The head in this subfamily is generally produced forward, 

 sometimes extremely compressed and with the sides prominently 

 carinate as is the case with Otiocerus. 



The adult of this species when at rest is nearly half an inch 

 long to the wing tip (the length of the body is only three-sixteenths. 

 of an inch). It rests with the long, delicate wings folded together 

 parallel and thus presents a general resemblance to a Caddis fly. It 

 may vary in color from a nearly uniform, pale yellowish or yellow- 

 ish green in the one female obtained to a yellowish green marked 

 with strongly contrasting red or reddish brown in the males as fol- 

 lows : The broad stripe extends from the tip of the head on either 

 side to the bronzy or blackish eyes, is continued by broken spots just 

 below and behind these organs, and a larger, reddish area laterally 

 on the pronotum and on the anterior portion of the mesonotum, and 

 may be followed as an oblique stripe from the base of the fore wing 

 to its posterior margin near the distal third, which latter is marked 

 by a slight marginal fuscous Hne. From this point the reddish 

 markings are produced in a more or less broken, marginal line to 

 the anal angle, there being a small subapical branch near the distal 

 fifth and a much more conspicuous one at the distal third and ex- 

 tending as an irregular, oblique mark to the anterior distal angle. 

 There is, in addition, an irregular, reddish mark near the middle 

 of the wing; the hind wings are nearly colorless. The head is 

 strongly compressed, being greatly produced anteriorly and with 

 strong lateral dorsal carinae. The male antennae are a variable 

 reddish and remarkable, since each is composed of three irregular 

 branches apparently arising from a basal segment, the anterior 

 distinctly capitate. The antennae of the female are but two- 

 branched, the anterior one slightly capitate and apically with a 

 bristle nearly as long as the branch. The ovipositor is short, the 

 organs uniting to form a conical apex. The legs are a nearly uni- 

 form yellowish transparent. The pale yellowish abdomen extends 

 only to about the middle of the wings and is variously shaded with 

 reddish. The male is easily recognized by the conspicuous pair of 

 yellowish transparent, inflated, strongly curved clasping organs. 



A colony of nymphs of this species were taken at Poughkeepsie, 

 N. Y. May 12, 1910 under the dead bark of a stump, possibly beech. 

 The insects moved slowly, and eleven days later adults emerged. 



