364 THE CANADIAN ENTOMOLOGIST. 



LARVA OF PTOCHORYCTIS TSUGENSTS KEARFOTT. 



BY W. T. M. FORBES, NEW BRUNSWICK, N. J. 



Head and cervical shield heavily chitinized ; anal plate less so. 

 Tubercles broad. Granulations of fine sinuous lines of dots in the thinner 

 portions, becoming polygonal patches of dots on the tubercles. 



Head higher than wide, a little squarish at the top. Epicrania high, 

 extending far above top of adfrontals and setae i ; i directly above ii and 

 separated by only about 1/7 height of head (measured from lower edge 

 of clypeus to vertex); ii distant from adfrontals ; six ocelli, the posterior on 

 a level with the lower anterior, but separated by a cleft extending up from 

 the antennal membranous area. Lower ocellus at middle of posterior 

 edge of the antennal area. Front only 1/5 height of head, about as high 

 as wide, the setae about a third way up and far apart ; the punctures l^ 

 as far apart and much lower. Adfrontals broad, not extending far above 

 top of front, witli both margins evenly sinuous ; i above top of front, and 

 puncture much nearer to it than to ii. Clypeus large, with setae far apart. 

 Labrum slightly notched, ii higher than i, iii obliquely above iv; puncture 

 between i and ii and higher. First free joint of maxillary palpus not as 

 large as in Cacoecia (Ann. Ent. Soc. Am., HL pl- 20, fig. 137) ; sclerites 

 of maxilla separate, the stripes more lightly chitinized, the subgalea send- 

 ing a projection between the palpifer and base of palpus ; cardo large. 

 Submentum and mentum fused, the lines of separation indicated by two 

 parallel longitudinal slits, between which there is a chitinized area. Setae 

 distant. Antennse about as in SiincEthis (loc. cit., fig. 140), but the first 

 two joints are equal in diameter. 



Cervical shield as wide as the segment, extending down to the 

 -spiracle ; it may fuse shortly with the large prespiracular plate in front of 

 it. Meso- and metathorax, with ia + ib, iia + iib ; iv + vand on a level 

 with iii. True legs moderate. On the abdomen, i and ii are on a level, 

 distant ; iii is a large ring, in the centre of which there is a small ring 

 bearing the seta and a couple of projections ; iv + v, iv minute, above and 

 in front of v ; vi single; vii consisting of an oblique row of five setae and 

 a sixth just behind the upper two. Prolegs not strongly projecting, with 

 a complete ellipse of 50 hooks, alternately of 2 3-lengths. Anal prolegs 

 with a bent bend of hooks, and also with extra setae in the region corre- 

 sponding to vii. On A I and A2 vii is of 3 setae ; on A7 of two and on A8 

 and A9 of one only. On the ninth segment i and ii are obliquely placed, 

 and ii are very far apart. 



The outer ring of iii might be easily mistaken for a spiracle, and only 

 occurs on the spiracle-bearing segments of the abdomen, 



November, 1910 



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