192 Annals Entomolgoical Society of America [Vol. IX, 



From Palmerlee, Ariz., Aug. (Biederman). It is distin- 

 guished from C. sylvosus by the much longer third joint of 

 antennas, and the second joint not quite as long as in that 

 species. 



Conops brachyrhynchus var. semifuscus n. var. 



Agrees with the type in structure and general coloration. The 

 femora are almost wholly pale; the pale mark on tip of second and base 

 of third abdominal segment is much longer, the last segment and basal 

 part of hypopygium more yellow; the humeri yellow pollinose and the 

 dark of wings stops at the third vein (in C. brachyrhynchus the dark 

 gradually fades off.). 



From Jemez Springs, N. Mex., 6 July (Woodgate). 



Zodion. 



In this genus are a number of closely related species; several 

 ■of the Eastern forms are best separated by the shape of the 

 ventral plate of the female. The forms intermediate in size 

 I have placed twice in the following table, since they vary in 

 size. Z. fulvifrons sometimes has the first posterior cell closed, 

 so it also occurs twice in the table. 



1. Thorax and abdomen gray, with very distinct black spots; legs pale, also 



with black spots pictiiliim 



Thorax, abdomen and legs with only indistinct black spots or with lines or 

 streaks 2 



2. Thorax with two pale submedian stripes, abdomen largely pale, with oblique 



dark bands obliquefasciatum 



Thorax without pale stripes 3 



3. Palpi rather long, clavate palpalis 



Palpi minute, cylindric 4 



4. Very small species, hardly over four millimeters 5 



Larger species, nearly six or-more millimeters in length 9 



5. Last joint of antennas wholly pale; first posterior cell closed 6 



Last joint of antennas wholly pale; cell open; legs black, abdomen not marked 



with pale triste 



Last joint of antennae dark at tip 7 



;6. Cell petiolate; abdomen of d' mostly dark parvum 



Cell closed in margin; abdomen of cf" mostly pale abdominale 



7. Cell short petiolate; basal part of c? abdomen pale yellowish scapulare 



Abdomen black with gray marks,* cell open 8 



8. Eastern specimens navellum 



Western specimens (probably the same) pygmcsum 



9. First posterior cell closed ' 10 



First posterior cell open 12 



10. Abdomen of d^ pale yellowish at base; last joint of antennae dark at tip. 



scapulare 

 Abdomen not paler at base; last joint of antennas not dark at tip 11 



11. Thorax gray with two or three dark stripes; abdomen not usually pale. 



fulvifrons 

 Thorax not so plainly marked, abdomen of d^ pale yellowish abdominale 



