DESCRIPTIOX OF NEW INSECTS. 



By a. S. Packard, Jr., M. D. 



DIPTEROUS LARVA FOUND IN THE GIZZARD OF PICOIDES ARCTICUS. 



Fig. G5, a, dorsal, h, ventral view of larva; c, end of body; d, side 



view of end of body 

 magnified. 



e, dorsal view of end of body ; /, bead, greatly 



Fig. 65. 



Body white^ cylindrical, a little flattened, with twelve segments exclu- 

 sive of head, the segments moderately convex. Head very minute, 

 sunken in the small pro- 

 thoracic segment, (which 

 is much smaller than the c 

 second or mesothoracic T^j^ 

 segment ;) subtrianguhuy"^ — 'N 

 in form, a little longer J 



than broad ; a transverse ^■~-- — ^ 

 suture just in front of in- 

 sertion of anteniue indi- 

 cates the posterior edge 

 of the clypeus. Antennae 

 cylindrical, two-jointed, 

 the second joint longer 

 than basal, and rather 

 slenderer, its tip reaching 

 as far as the end of the 

 head. 



Terminal segment of the 

 body much smaller and 

 narrower than the penultimate, bearing two large, stout, upcurved 

 corneous hooks, with adjoining bases ; nine stigmata, one on prothorax 

 and one on first eight abdominal segments, round minute, corneous, the 

 ninth round, with around area on one side. 



Length .35 inch; 135 specimens taken ''from the gizzard of Picoides 

 arcticus, (No. 23G,) Lower Geyser Basin, August 20, 1872, by 0. U. 

 Merriam." Some of these larvi© were half grown. Most of them were 

 l)erfectly preserved ; a few had been partially digested. With them 

 v>'ere associated a part of the bodj' of a Gerambycid larva, and a i)ortiou 

 of the elytra of a Scolytuslike beetle, so that they must have come from 

 under the bark of some tree. 



This larva, remarkable for its large size, its minute head, and terminal 

 upfcurved hooks, like those of many coleopterous larva? living under 

 bark, seems to be related to the young of the Cecidomyiadw, or perhaps a 

 closely allied group, from the two-jointed antenna', the general form of 

 the minute head, and the presence of nine stigmata. Several Cecidomyia 

 larvai have a pair of anal appendages, though not so marked as in the 

 present form. 



DIPTEROUS LARVA. 



