342 



— Hind coxae yellow; hind femora darkened on apical third; eyes 

 separated by more than one fifth the head-width; furcation of 

 fourth and fifth branches of radius distinctly proximad of, or in 

 line with, a line drawn from apex of that vein to point of furca- 

 tion of first and second branches of media tenfJiredinoides. 



Xyi^omyia pai^upES Loew 



Siihula pallipcs Loew, Berl. Ent. Zeitsehr., 1S63, p. 6. 



Larva. — Length, 7-9 mm. Dark brown, head and thoracic seg- 

 ments yellowish, the hitter darkened on sides and posteriorly. 



Protruded portion of liead slightly longer than prothorax, the dor- 

 sal surface wnih. several strong hairs (PI. XLVIII, Fig. 15), labrum 

 conically produced, the apex very sharp (PI. XLVIII, Fig. 4) ; man- 

 dibles recurved, slightly dentate; maxillae prominent, their ventral 

 surfaces with numerous narrow transverse ridges, palpi inconspicuous 

 (PI. XLIX. Fig. 7) ; labial plate as in Figure 10, Plate XLIX; an- 

 tennae sessile ; eyes distinct but not protruded ; ventral surface of head 

 with a long hair on each side in transverse line with the eyes. Sur- 

 faces of thoracic and abdominal segments finely shagreened excepting 

 a large irregular area on dorsum of prothorax, a narrow transverse 

 area on ventral surface of same segment, a pair of narrow transverse 

 plates on dorsum of metathorax^ and the tubercles on the various 

 segments. Prothoracic spiracle with 3 openings (PI. XLVIII, Fig. 

 9). Abdominal segments 2-7 each with a transverse series of small 

 round warts near anterior margin on dorsum ; eighth segment with 7 

 rather large warts in an irregular (2, 3, 2) transverse series proximad 

 of median line, posterior lateral angle with 2 small warts; all ventral 

 segments with a closely placed series of small warts on their anterior 

 margins ; anal opening slightly T-shaped, the margins toothed ; spi- 

 racles distinctly separated, situated wnthin an apical chamber whose 

 margins protrude lip-like from apex of eleventh segment and appear 

 like an additional segment ; thoracic and abdominal segments, except 

 the apical one, each with 6 hairs, one on each lateral margin and one 

 on each side on venter and dorsum; apical segment as in Figure 14, 

 Plate XLVIII. 



This description was drawn from larvae obtained by me October 

 21, 19 1 6, imder the bark of trees which had been felled in the spring 

 cf the same year. The bark w^as beginning to loosen, and larvae of 

 Euxesta, LoncJiaea, and Hetcronicringia were abundant under it. The 

 Xylomvia larvae were found to be predaceous, feeding indiscriminate- 

 ly upon the other larvae. They have a peculiar habit of raising up 

 the thoracic segments when disturbed, but are very sluggish. 



