AET. 2 BKKTLE LARVAE OF GALEEUCINAE BOVING 15 



TKIRHABDA BREVICOLLIS LeConte 



(U. S. Nat. Mus. ; described from larva in vial marked: " F. H. Chittenden 

 June 1901, Victoria, Texas, J. D. Mitchell coll.") Probably reared. 



Mature larvae differs from that of T. canadensis in having light 

 brownish sl^in and small dark-brown dorsal sclerites. Each abdomi- 

 nal segment with exterior sclerites of prescutum of about the same 

 size as a spiracle and distance between exterior and interior sclerites 

 of scuto-scutellum about three times the diameter of the exterior 

 sclerites. Sternal sclerites of abdomen very tliin and of the same 

 pale yellow color as the skin; sternal region of abdomen therefore 

 apparently without sclerites. 



Habits. — Larva of T. hrevicollis defoliates the bushlike tree of 

 Zanthoxyluni (Rutaceae) or prickly ash. 



According to L. O. Howard," J. D. Mitchell, Victoria, Tex., says 

 "the larvae burrow into the ground, where it is slightly raised, 

 making runs or galleries from which they crawl out or about day 

 and night, but never more than a few inches from the colon}' home." 

 The pupal stage is passed in the ground. 



TRIRHABDA NIXroiCOLLIS LeConte 



(U. S. Nat. Mus.; described from larva in vial marked: "No. 4979, Lo.s 

 Angeles, California, D. M. Coqnillet coll.") No record of rearing. 



The mature larva resembles the larva of T. canadensis by having 

 dorsal sclerites of about the same size and similarly striated as in 

 that species and by having rather long setae. It differs from it by 

 being somewhat lighter in color with greenish, bronze-colored dorsal 

 skin and sclerites and by having pale-yellow ventral skin and very 

 thin and pale-yellow sternal sclerites on the abdomen. 



TRIRHABDA TOMENTOSA Linnaeus 



(U. S. Nat. Mus.; described from larva in vial marked: "708, Haw Cr. 

 Florida, 1896.") H. G. Hubbard collected and determined, probably by 

 rearing. 



Resembles the larva of T. canadensis in most characters, but has 

 slightly larger dorsal sclerites and much thinner and shorter setae, 

 the latter being about half as long as the sclerites in which they are 

 inserted. 



TRIRHABDA ATTENUATA Say 



(U. S. Nat. Mus.; vial marked: " Hopk. U. ». 15729a. On foliage of 

 Artemisia species. Yosemite Park, California, July 24 1918. T. E. 

 Patterson.") Reared. 



The mature larva is somewhat smaller, more elongate and cylin- 

 drical than T. canadensis. The color is dark bronze dorsally and 



"U. S. Dept. Aerri. Bull. Xo. .H8. new scrips, 1904. p. 108. 



