AET. 10 NORTH AMERICAN TACHINID FLIES WEBBER 5 



4. Front, face, and post-orbital region cinereous, tlie former sometimes with 



golden tinge; bucca one-fifth the eye height 5. 



— Front, face, and post-orbital region golden pollinose ; frontal vitta about 



one-fourth the frontal width ; bucca one-eighth the eye height. 



9. texana, new species. 



5. Arista thickened from one-half to three-fourths way ; front pulvilli of male 



less than length of last tarsal joint; abdomen black, usually thick gray 

 pollinose with anal segment concolorous or golden pollinose; marginal 

 bristles of second abdominal segment often weak. 



8. archippivora (Williston). 



— Arista thickened at base and gradually tapering to apex ; front pulvilli of 



male longer than last tarsal joint ; abdomen black, thinly gray pollinose, 

 anal segment never golden ; marginal bristles of second abdominal seg- 

 ment well developed 4. samiae, new species. 



6. Hind tibiae evenly ciliate with one longer bristle 7. 



— Hind tibiae evenly ciliate without a longer bristle; abdomen yellowish, 



thinly gray pollinose, median vitta absent or at most poorly defined. 



17. laniiferae, new species. 



7. Thorax and abdomen black, gray pollinose, the latter without a median 



vitta 9. 



— Thorax and abdomen or the abdomen alone otherwise colored 8. 



8. Abdomen bi'own or yellowish with a clearly defined median vitta ; front 



pulvilli of male short 18. ferrugiiiea (Reinhardt). 



— Head and body entirely golden pollinose ; abdomen without clearly defined 



vitta; front pulvilli of male long 19. spectabilis (Aldrich). 



9. Mid-tibiae with one strong bristle on the outer front side near middle or with 



one strong and one weaker one above it, rarely with two equally strong 

 and a weaker bristle above them, but if so, then the abdominal hairs are 

 sub-erect at most 10. 



— Mid tibiae with three strong bristles on the outer front side near middle, 



if with only two strong and a weaker one above them, then a portion 

 of the abdominal hairs along the dorsum are erect ; forceps of male 

 genitalia (viewed from behind) at widest part over one-fourth their 

 length ; front with several strong bristles outside of the frontal rows 

 which are equal in strength to the latter 7. dimmocki, new species. 



10. Robust forms from 8-12 mm. in length ; front in male usually over one- 



fourth head width 11. 



— Uniformly slender flies 5-8 mm. in length ; front and face deeply golden 



pollinose; front narrow, ih male about one-fourth and in female less 

 than one-third head width ; abdomen black, moderately yellowish gray 

 pollinose 5. melalophae Allen. 



11. Front of male and usually that of female destitute of any strong bristles 



outside of the frontal rows; posterior spiracles of puparium not in 

 a depression 12. 



— Front in both sexes with several strong bristles outside of the frontal 



rows ; forceps of male genitalia viewed from behind, at widest part, 

 more than one-third their length ; front tarsi of female not noticeably 

 enlarged ; posterior spiracles or puparium in slight but well defined 

 depression (if in male the front pulvilli are short, see archippivora). 



4. samiae, new species. 



12. Forceps viewed from behind, at their widest part, at least one-third their 



length ; front tarsi of female not noticeably thickened 13. 



