Sept. 1899] DoANE : Descriptions of New Trypetid^. 179 



cross-band is more oblique, beginning just before the tip of the second vein and ex- 

 tending across the posterior cross-vein it reaches the posterior margin of the wing just 

 back of the tip of the fifth vein, where it is usually broader, fading out gradually as it 

 nears the second cross-band ; completely united with the third cross-band anteriorly 

 and seaming the tip of the wing is another band reaching a little beyond the tip of the 

 fourth vein ; between the second and third cross-bands and parallel with the latter is 

 a narrow band reaching from the costa to the third vein ; the whole of the anal and 

 second basal cells and the bases of the first basal and sub-marginal cells show a dis- 

 tinct yellowish tinge ; veins yellowish ; first and third with rather stout bristles, latter 

 with very few, one or two of which are beyond the anterior cross-vein. Length, ^ 

 5 mm.; ^ 6 to 7 mm. Nine males, four females. 



Habitat : Wash., Ida., Mich., S. D., Minn. 



I have before me quite a large series of this species which seems to 

 be subject to little variation, although in a single female the abdomen 

 is much darker, almost brownish, and the third cross-band is inter- 

 rupted at the third vein. 



Differs from T. flavonotata Macq., which it most closely resembles 

 in having no trace of lighter markings on thorax ; dark instead of 

 light cilia on hind tibia ; in having bristles on posterior femora and 

 the black spot behind the wings, etc. 

 CEdicarena diffusa Snow. 



The length of the ovipositor is subject to some variation, some- 

 times being fully as long as the three preceding segments taken to 

 gether. 



Habitat : Wash., S. D., Colo. 



Plagiotoma obliqua Say. Illinois, Iowa. 

 Trypeta palposa Loeiu. Minnesota, Iowa. 

 Trypeta occidental is Snow. 



It may be well to add to the description of this species that the 

 color is light grayish yellow, lighter than T. palposa; fifth segment 

 of male with a black spot on each posterior corner. In some speci- 

 mens the band seaming the tip of the wing is not united anteriorly 

 with the third cross-band, but separated from it by a narrow hyaline 

 space. 



Habitat : AVash., Ida., Colo., S. D. 



Trypeta straminea, sp. nov. (PI. Ill, Fig. 2). 



$ . 9 . Yellow ; head brighter yellow ; front rather broad ; bristles brownish 

 black ; postorbital bristles whitish ; antennre yellow ; third joint rather short broad, 

 rounded ; arista yellowish at base, darker towards tip ; palpi broad, rather large, with 



