146 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



with a pouch and a water vascular system. No traces of a gener- 

 ative apparatus observable. Length i mm. 



[June, 1877. No. 442 See Bibliography.] 



REMARKS ON THE SEVENTEEN-YEAR LOCUST, THE HESSIAN FLY. 



AND A CHELIFER. 



Prof. Leidy remarked that he had returned last evening from a 

 short visit to Easton. He stated that the Seventeen-year Locust, 

 Cicada septcmdccim, had made its appearance in the vicinity of that 

 town. He further stated that the wheat in the same locality was 

 seriously affected by the Hessian Fly, Cecidomyia destructor, which 

 has now passed into the puparium stage. In one field examined 

 half the crop was destroyed by the insect. He further remarked 

 that his little daughter brought to him an Elater, Alans ocidatus, 

 and, on her account, professing to attach .some interest to a common 

 insect, in examining it with more than usual attention, he was 

 surprised to find concealed beneath the elytra six Chelifers. He 

 was not aware whether the Elater was commonly infested in this 

 manner. In another specimen subsequently found there were no 

 Chelifers. The Book- scorpion, C. nnisconini, appears not to be 

 common with us, as he rarely met with it. He had occasionally 

 met with another species, perhaps C. cancroidcs, attached to the 

 House-fly. The Cluiifcr of the Elater is different from either of 

 those just named, and is perhaps an undescribed species. Its char- 

 acters are as follows : 



Chclifer Alius. — Body in general chestnut brown ; the pedipalps 

 and the dorsal shield of the cephalothorax being darkest ; the abdo- 

 men lightest, and in the largest individuals, probably females, whit- 

 ish with transverse dorsal and ventral bands of brown. Body with 

 the sides nearly parallel, but widening slightly posteriorly, being 

 widest near the termination of the abdomen, except in the largest 

 female, in which it is widest near the middle of the abdomen. 

 Maxillary palps shorter or not longer than the body ; intermediate 

 joints of the .same about twice the length of their thickness. Length 

 of body from 1V2 to 2V2 mm. ; length of pedipalps from 1)2 to if^ 

 mni. All parts are hairy, but the abdomen of the largest ones is 

 less so than in the others. 



The species bears much resemblance in form and color to the 

 C. reiissii, Koch. It also resembles the C. americanus, De Oeer, 

 but it does not possess the knob on the penultimate joint of the 

 pedipalp. 



