DII'TKKA HKLO.MY/IIU:. 547 



Family HELOMYZID^E Westwood. 

 HKTKHOMYZA Fallen. 



I I KTKKoMV/A SENILIS. 

 I'l. :{, Figs. 1, 2. 



/MITOMII/- xinili* Srinlil., Ki-p. Progr. Gcol. Surv. Can., 187.VHTI'.. -jr.". HT7). 



In this case \vi- have but a fragment of one wing-, but one which exhibits 

 most iif tin- peculiarities of ncnration, and, so far as it goes, very well pre- 

 served. Tin- wing is slightly discolored, but was apparently hyaline in lift-, 

 covered rather profusely with exceedingly delicate microscopic hairs which 

 cover veins as well as membrane; the veins, excepting the costal, are test a - 

 ceous ; the costal vein is blackish fuscous, covered with short bristles, and 

 extends bexond the third longitudinal vein, where the wing is broken : the 

 an.xiliarv vein strikes the costa at about the end of the first quarter, and the 

 nearlv straight lirst longitudinal vein before the middle of the wing ; this 

 latter vein is ban- or only feebly pubescent ; the slightly sinuous, toward the 

 extremity ^lightly upturned, second longitudinal vein divides about equally 

 the space between the costa and the third longitudinal vein : the latter is 

 almost straight, scarcely bending to receive the small transverse vein at 

 about the end of its basal third, and terminates at the broadly rounded tip 

 of (hewing: the small transverse vein lies just before the tip of the lirst 

 longitudinal vein; the fourth longitudinal vein is nearly straight, onlv bent 

 next the transverse veins ; before the small transverse vein it is parallel 

 and rather closely approximated to the third longitudinal vein: beyond, it 



diverges slight! v and regularly from it, and lievond the lar^v transverse 

 vein again becomes parallel to it; only the basal portions of the fifth and 

 sixth longitudinal veins are present, and the extreme base of the wing is lost; 



but the basal cells an- evidently small, and their extremities lie just beneath 

 the union of the second and third longitudinal veins; the wing is broad, 

 ovate, and well rounded; the costa pretty strongly arched. 



Length of fragment. 4""" : probable length of wing, 4. f>""" : probable 



breadth of same, i" 1 "". 



( ( )nesnel, British Columbia. One specimen. No. I . l>r ( M hau-Min, 

 (ieolngic;d Survey of ('anadal. 



