1903.] NATURAL SCIENCES OF PHILADELPHIA. 561 



8. First abdominal segment with a large black triangular mark in the 



middle ; abdomen without light spots ; mandibles simple, 



tintinnabulum, Ckll. 

 First abdominal segment not so marked _ . 9. 



9. Face and front without black; at most a faint blackish stain above 



the antennae, . 10. 



Front with a great deal of black ; mesothorax with a median black 

 band, 14. 



10. Third antennal joint hardly half length of fourth: anterior coxae 



simple, erythrcea, D. T. 



Third antennal joint over half length of fourth, 11. 



11. Abdomen with small lateral cream-colored spots; second and third 



submarginal cells much narrowed above, . . ultimella, Ckll. 



Abdomen without such spots; second submarginal cell broader 



above, : ^^' 



12. Length about 10 mm. ; hind femora with a black stripe behind, 



ruhrica, Pro v. 

 Length 8 mm. or less; hind femora with at most a black suffu- 



sion. 



13. 



13. Scape with conspicuous long dark hairs ; mesothorax with a median 



black stripe, calif ornice, Ckll. 



Scape without such hairs; mesothorax without a median black 

 stripe, rhodosoma, Ckll. 



14. Length at least 10 mm.; metathorax black with two red spots; 



hind femora with no black stripe behind, . . excellens, Ckll. 



Length 8 to nearly 9 mm. ; metathorax, seen from above, red with 



a median black band, 15. 



15. Hind femora with much black behind; scape with dark hairs; a 



red spot in front of middle ocellus, latifrons, Ckll. 



Hind femora red behind; scape without dark hairs; no red spot 

 in front of middle ocellus, atrofrontata , Ckll. 



Descriptions and Notes. 



Nomada (Holonomada) hempMlli, sp. n. 



cJ*. — Length 12-13 mm.; black and yellow. Allied to A', superba 

 and A^. edwardsii, resembling the latter by the black and yellow (instead 

 of red and yellow) legs, and the former by the absence of yellow spots 

 on the metathorax. It differs from N. edwardsii also as follows: 

 Lateral face-marks broader above, with much black between them and 

 the supraclypeal mark ; flagellum paler beneath ; yellow patch on scu- 

 tellum large and entire (in edwardsii divided into two spots or patches) ; 

 abdomen with less black above, the bands on second and third seg- 

 ments not or hardly contracted in the middle; a minute yellow spot 

 present at summits of eyes; legs with a more orange-yellow color, and 

 with less black, the anterior and middle femora yellow with a black 

 patch above, hind femora black above except apically, anterior and 

 36 



