290 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 



found at this work in 1S76. One of tliese (Fig. 24, a) is evidently the larva 



of some species of Rarj^alus^ and proba- 

 bly of ^. herhivagiis Say, which is quite 

 common in the locust regions. It was 

 described in 1876.^^ It is an active 

 creature, with powerful head and jaws, 

 which, together with the prothorax, are 

 light brown, the rest of the body being 

 pale, and gradually tapering to the end, 

 which is furnished with a stout anal 

 proleg and two 4-jointed appendages. 

 We have failed in our efforts to rear 

 this larva to the perfect state, and can 

 give but a more detailed description of 

 it for the scientific reader. 



Color, yellowish - white ; prothorcax and head 

 Tiighly polithed yellowisa-biowu ; the jaws 

 darker. Head broad, depressed, aud rngose in 



Eia. 24. -HAEPALUS (?) LARVA THAT PREYS ^^^^^ [ J^^« ^^^^' ^"^"f ' ^^^^ ^"^^ J^?^? j'f 



ON Locust Eggs.— a, larva fr^m above: b, ^^^ strong middle tooth; antennae 5-jomted, 

 head, from beneath; c, leg— enlarged. (After joints 4 and 5 scarcely equaling 3 in length ; max- 

 Eiley.) illge elongate, subcylindrical, with a 4-jointed 



outer and a 2-jointed inner palpus; mentum elongate, its base s >ldered with the lower 

 head ; labrum also elongate and with 2-jointed palpi; all trophi armed with stiff hair. 

 Prothoracic joint swollen, wider than head, twice as long as succeeding joint, horny, aud 

 with adarker anterior border, limited by a transverse stria posteriorly, and marked with 

 fine longitudiual strise. Legs, except coxae, dark brown and thickly beset with short, 

 spinous bristles of the same color. Abdomen tapering to end, with no horny plates, 

 but each joint with two transverse rows of stiff yellowish hairs, the posterior rows 

 strongest. Stigmata lateral, xjale, the first pair on an anterior mesothoracic fold. 

 Anal proleg stout, the cerci 4-jointed (join s 3 and 4 small and imperfectly separated) 

 and reaching but little beyond it ; eyes small, dark, and just behind base of antennae. 

 Length of largest specimens 0.58 inch. 

 Many specimens feeding on eggs of Caloptenus spretus. 



The Egg-Feeding Amara {A^nara ohesa Say^^).^Another larva of 

 about the same size, and belonging to the same family as the preceding, 



was also found, in 1876, prey- 

 ing on the locust eggs. It 

 may easily be distinguished 

 from the other by a series of 

 broad, smoky or dark brown, 

 horny plates along the back, 

 and by somewhat paler horny 

 pieces along the sides and be- 

 neath (Fig. 25, a). The pro- 

 thorax is narrower, and the 

 body bulges at the middle; 

 the legs are pale, and the 

 y\>^«^_ ^^ ^' <:^^w^^'^ ^j^^l Q,^v{^\ are quite short. 



Fig. 25.-AMARA OBESA.— a.larva; cZ, under side of one of This plated larva WaS again 

 its middle joints; e, its head beneath ;/, its le?; .9, if a anal „ j • i .^i^^^.^ ^.» 



cerci and proleg from side; b, pupa; c, beetle. (After Eiley.) lOUnU lU large numDCrS, lU 



53 9th Mo. Ent. Rep., p. 97, 1876. See, also, Packard's Eep. to Dr. Hayden, 1877, p. 662. 

 5* Belongs to Zimmerraann's subfjenus Cetia, He considers it the same as the European ^Jatncia Dej., 

 but Cbaudoir insists taht it is different. 



I 



