ABT. 12 KEYS TO SAPROMYZIDAE MALLOCH AND McATEE. 15 



o. Face pale shining testaceous, with a round shining brown or blackish spot 

 on each side at middle; frons and parafacials concolorous with face, the 

 former with three elongate black stripes, the latter with two round black- 

 ish spots, one at base of antenna and the other below eye, 



eucephala Loew. 



Face not as above, imspotted, with a single central velvety black spot, 



or if with two blackish spots the entire head is densely gray prui- 



nescent and the other markings are not as above 6 



G. Face without a central velvety black spot 7 



Face with a central velvety black spot 15 



7. Thorax largely or entirely blackish and densely gray pruinescent; hind 



tibia with a fuscous band near base and another at apex 8 



Thorax and abdomen yellowish testaceous, shining; hind tibia unicolorouf 



yellowish, not annulate 11 



S. Palpi black; large species, about 5 mm. in length; abdomen gray pruines- 

 cent, the apical two segments each with a narrow fuscous fascia, scutel- 



lum not subtruncate at apex buchanani Malloch, new species. 



Palpi yellow ; species in other respects not as above — - 9 



9. Large species, 5-6 mm. in length; each adbominal tergite with a fuscous 



fascia anteriorly magna Coquillett. 



Smaller species, averaging less than 4 mm. in length ; abdominal tergites 

 without complete fasciae 10 



10. Each abdominal tergite with a brownish black transverse spot on each side ; 



abdomen yellowish glauca Coquillett. 



Abdomen yellowish testaceous and without lateral spots cana Melander. 



11. One of the setulae near upper extremity of the series on side of face strik- 



ingly longer and stronger than the others ; arista almost bare, 



ordinaria Melander. 



All the lateral facial hairs small and weak; arista plumose or short- 

 haired 12 



32. Arista plumose; dorsum of thorax immaculate or with a more or less 

 distinct grayish or fuscous median sttipe ; ocellar bristles longer than 

 postvertical pair; second abdominal tergite of female with several long 

 bristles on each side of posterior margin ; abdomen unspotted but 

 sometimes indistinctly fasciate 13 



Arista short-haired, small species, not over 3 mm. in length ; dorsum of 

 thorax with a small brown spot at base of each bristle and hair; ocellar 

 bristles very small; abdomen with a blackish central spot on each tergite 

 except the first, and a smaller spot on each side of the apical two or three 

 tergites punctifer Malloch. 



13. Wings distinctly iufuseated fumipennis Melander. 



Wings yellowish 14 



14. Thorax immaculate flaveola Coquillett. 



Thorax with a grayish or fuscous central stripe, 



flaveola, var. univittata Coquillett. 



15. Scutellum witli a black mark on each side ; base of antennae black 16 



Scutellum and antennae entirely yellow 17 



16. Pleura immaculate octopunctata Wiedemann. 



Pleurae with one or two black spots, octopunctata, var. slossonae Coquillett. 



17. Thorax quadrivittate ; abdomen with conspicuous brown spots, 



valida Walker. 

 Thorax and abdomen testaceous, immaculate puncticeps Coquillett. 



