REPORT OF THE ENTOMOLOGIST. 257 



ingTeRi:i mny contain from two to thirty of the Inrvae, which, Avhen full 

 grown, measure on an averajje G""" (about one-quarter of an inch) in 

 length. While siill feediiij; they are pale orange in coI.m', but, after 

 ceasing, they become of a bright orange. The spiracles of the anal seg- 

 ment are at the summit of two protruding tuben;les, and aroujul each 

 is a smaH whorl of f<);ir fleshy papillae. The other spiiaeles are .small 

 and black. Tbe larx'ae are much elongated, and are widest at the (Jth 

 segment ; the under sides^ of segments 1 to 7 are furnished each with two 

 transverse rows of short black or brown spines, probably for locomotive 

 purjKvses. While bunowing in the bark and resin the anal tubercles 

 are always at the surface. When, however, the larva contracts to pu- 

 pate, the end of the body is drawn in, but an open channel is left so that 

 the air has free acciess. Wlien about to give out the acUdt, the pui)a 

 works its way to the suiface of the resin and protrudes half its body, so 

 that there is no daitgerof the midge becoming fastened in the sticky 

 giim. Dried lumps of resin fairly ijristling with [)rotrudiug pupa skins 

 are a common sight on trees affeeted l)y these insects. 



The adult insect is large, measuring O'"" (.354 inches) in wing expanse, 

 Tlie head is blackish, the thorax gray, and the abdomen dark red. The 

 male antennae are 2(} jointed, with alternate single and double joints, all 

 pedicelie<l ; the female, 14-jointed. The main peculiarity of the adult 

 form is in the reniarkable gibbosity of the head, the eyes joining to- 

 gether at the summit and covering nearly the whole head. The wing 

 venation ami other points are shown in the plate. The resin exuding from 

 the wounds on /'. inops is perfectly clear, and permits one to count the 

 number of the larvae and to watch their every motion. 



Upon the Loblolly pine (P. taeda), however, it is milky, and the pres- 

 ence of the insect cannot be asceitained without opening the mass. 



We have as yet no data upon which to state definitely whether the 

 eggs of the midge are laid upon the uninjured bark, and it is the work 

 of the larvae in the bark which causes the resin to exude, or whether it 

 is only in resinous exudations, caused by a bruise or by the work of 

 some other insect that the eggs are laid. In the clear lumps on IHnus 

 inops the larvae are always observed with their heads applied to the 

 abraded bark. 



Somewhat similar, though evidently distinct, larvae were found feed- 

 ing in the resin exuding from the wounds made by the larva of Retwia 

 Comstockicma in the twings of Pinvs rigida. It is probalOe that they may 

 be Osten-Sackeo's Cecidomyia pinusmops, but it is difficult to say posi- 

 tively, as his di'scription of this species is so very indefinite. 



A np:w wheat-fly {Chlorops proxiwa Say). — April 19, 18.S0, speci- 

 mens of an insect infesting wheat were received from Mr. E, Schneider, 

 Fairview, Todd County, Kentucky. The wheat had been doing well 

 until within a few weeks of the time of sending, whc\i it began to turn 

 yellow in spots. Examination showed the insects working between the 

 blades and seemiiigly trying to reach the first joint. While some injury 

 had been done to the crop, it was still not at all seriously affected, as 

 there were in nearly every case enough uninjured aud quite vigorous 

 stalks h'ft iu each plant to insure a good crop. 



The first specimens receive<l were dried up greenish-yellow larvae. 

 "When alive they had evidently been fat maggots of about 7""" (.27 inch) 

 in length. A few days later additional specimens of the infested wheat 

 were received, in which were found several puparia (coiresi)onding to 

 the so-called " fiaxseed " state in the Hessian tiy). These were of a light 

 yellowish color, and the outer skin was so transparent that the inclosed 

 pupa could be readily seen. They were about G' •" long by 2°"" broad. 

 17 AG 



