THE BAG- WORM ; ITS PARASITES. 85 



tiactive features assigiu'd to it in the ttible by which to distinguish it 

 from its congeneric forms, are "Body black; legs and coxas yellowish- 

 rod; posterior tibise black annulated with white; posterior tarsi white, 

 the joints tipped with black ; antenna uuicolorous, brown or ferru- 

 ginous ; ahdoiniiial segments entirely black ; aureolet of anterior toing 

 complete; head entirely black m female, face ichite in male; tegvlcB 

 ioliite" The italicised characters separate it from the next species men- 

 tioned. 



PiMPLA coxQUisiTOR (Say).*— This spccics, not hitherto published, 

 to my knowledge, as a parasite upon the bag-worm,f was obtained 

 from some bags kindly sent to me by Mr. F. G. Shaw, of West 

 Brighton, Staten Island, N. Y. In the package containing about two 

 hundred of the bags, when opened upon its reception, October 12th, 

 four of tlie Piniplas were found alive. Others continued to emerge 

 until November Sth — not in large numbers, however — twenty-one 

 examples only being obtained. Probably not many had left the co- 

 coons previously, as it seems to be a late species, in the Southern 

 States making its appearance in mid-winter or early spring, and 

 attacking only the last brood of cotton-worms. Quite a difference in 

 size was shown in the examples, especially in the female, the largest 

 measuring eight-tenths of an inch to the tip of the ovipositor, and the 

 smallest but four tenths. 



A popular description of this species, as a common parasite upon the 

 cotton-worm, was given in 1847 by Dr. B. G. Gorham, of Louisiana, 

 which is quoted in Prof. Comstock's Report upon Cotton Insects, 1879, 

 p. 190. On page 198 of the same Report, the insect is figured, accom- 

 ])anied with Say's original description of the two sexes — the female 

 described as a distinct species under the name of pleicrivinctics. 



IIemiteles ? THYRinopTERiGis Riley. — This species, belonging 

 with the two preceding species to the Ichneumonidce, was described 

 and figured by Prof. Riley from five examples bred from a cocoon of 

 the basket-worm. J It is asmall form, being about one-third of an inch 

 in length, and one-half inch or less in expanse of wings. The oviposi- 

 tor is about one-half the length of the abdomen. The sexes are quite 

 unlike in appearance, for while the female is of a dull ferruginous 

 color, with its front wings covered by two dark bands, the male is 

 shining black with the wings destitute of bands or spots. Other dif- 



*Bost. Journ. Nat. Jlist., i, p. 234. 



+It is possible that the example referred to by Saj' as " obtained from a follicle of the 

 common foUiculatc Linneao ^wiyx with transparent wings, extremely abundant a few 

 years since in Maryland," was the T. ephemenvformis, although it was identified as Cluio- 

 campa Americana, the apple-tree tent-caterpillar, by Mr. Walsh. See statement and foot- 

 note on p. 45 of Bulletin No. 3 of the U. S. Entomological Commission. 



XFirst Rep. Ins. Mo., 1809, p. 150, pi. 2, figs. 11, 12; sumo dcscriplioii in Ball. No. G, U. 

 S. Ent. Comm., 1881, p. 65. 



