THE STATE ENTOMOLOGIST. 43 



The moth very closely resembles nebulo, as may be seen by referring to 

 Figure 20, d, which shows its wing characters, the colors being the same. In 

 this cut I have given two subsidiary sketches, the one at c showing the tj'-p- 

 ical nebulo, the other at e rej)resenting a crab ajiple feeding variety of the 

 same ; and the genei*al reader will readily perceive (providing the public 

 printer does not give us too mudd}^ an impression) that the intermediate 

 figure ((I) differs less from the upper (c) than from the lower one (e). Yet 

 the differences in the habits of the larvae show that the Walnut Case-bearer 

 is a distinct species. 



AcROBASis JUGLANDis, LeBaroii . — (Fig. 20, (?) — I have bred this species fromHickor}-, but as Dr. 

 LeBarou has also bred it abundantly from Walnut, and has siguitied his intention of describing it in 

 his second annua) Report, I adopt liis proposed name, and shall content myself with pointing out the 

 manner in which it may generally be distinguished from nebulo. Firstly, by the paler basal area of 

 the front wings, which is sometimes almost white, especially near the costa, and by the head and 

 ,*houlders and sometimes the cf antenna! horn partaking of this paler color. Secondly, bj- the dark^sr 

 median space, the dark triangular costal spot not being well relieved posteriorly, but extending so 

 as sometimes to darken the whole space. Thirdly, by the discal spots always being well separated. 



Such are its specitic characters as taken from 3 hickory-bred and 6 walnut-bred specimens; 

 but of the former there is 1 whicli when placed alongside of some of tlie moi'e abnormal specimens 

 of nebulo, can scarcely be distinguished from them, and, if chosen without knowledge of its larva, 

 would certainly be placed with tliem; while of the latter there are two which nearly as closely 

 resemble the variety nebulella. In general characters, in the size of the browu ti'iangular spot, and 

 the manner in which tlie inner margin is divided, juglandis is intermediate between iiebulo and nebit^ 

 lella. In one of the hickory-bred specimens, the general color is quite wai'm, and tlie basal area 

 cameous rather than white . 



Natural Enemies. — From a lot of parasites bred from this insect by 

 Dr. LeBaron, I find four distinct Ichneumon-flies. Three of them are black 

 with legs variously marked with yellow reddish and black, and they all be- 

 long to the genus Pimpla* which is characterized chiefly by the joints of the 

 abdomen being for the most part broader than long, and the ovipositor of 

 the female, with its sheaths, never extending more than the length of the 

 abdomen beyond its tip. The fourth is a j-ellow fly belonging to tha genus 

 Perilitus, and as I am kindly informed by Mr. E. T. Cresson, is a new spe- 

 cies. I therefore describe it by the name of 



Perilitus IXDAGATOK, X. Sp — Imago — $, Head almost glabrous, transverse, deep liouey-yellow, 

 the trophi pale, except the tips of jaws, which are dusky ; ocelli touching each other, black; eyes 

 black, very large, occupying nearly the whole side of face, and with a few very short hairs; antennas 

 with about 24 joints, pale fuscous; reaching, when turned back, to about the middle of abdomen. 

 Thorax honey-yellow beneath and very slightly pubescent: very finely punctured and slightly pubes- 

 cent above; prothorax hone3--yellow and prominently convex; mesothorax with lateral and posterior 

 sutures black ; metathorax black . Abdomen with the pedicel black and slightly punctured ; depressed, 

 narrow at base, widening behind, slightly pubescent above; the other joints glabrous, polished, deep 

 honey-yellow, the second joint largest and as long as all the subsequent ones together; ovipositor ex- 

 tending about the length of the abdomen beyond its tip, rufous with the sheaths black. Legs pale 

 honey-yellow, the tarsi, especially at tips, slightly dusky, the hind femora and tibiw a little dusky 

 towards tips, and a narrow rufous ring at base of former. Wings hyaline, iridescent; veins browu; 

 stigma honey-yellow, with an opaque brown claud; two cubital cells, the outer small, sub-quadrate; 

 the radial large; one discoidal, long and narrow. Length, exclusive of ovipositor O.IS inch. 



Described from 1 Q bred from Acrobasis Juglandis, LeB. 



* These ave Pimpla conquisitor. Say (EntofN. A. II, p. 689,) Pimpla indagatrix, Walsh,, Cress. 

 (Trans. Am. Ent. Soc. Ill, p: 146,) and Pi;np/o annulipes Br. (Hist. Nat. des Ins. Hym. IV, p. 

 102.) 



