358 CHARLES T. BRUES. 



15. Scutellum with four equally strong bristles 16. 



Scutellum with only two bristles 18. 



16. Palpi of male enlarged and without the usual bristles, fifth vein sinuate at 



the middle and then parallel with the fourth, .lliagni pal pis Aid. 

 Not such species 17. 



17. Tip of first vein twice as far from the humeral cross-vein as from the tip of 



the third giraudii Egg. 



Tip of first vein one and one-half times as far from the humeral cross-vein as 

 from the tip of the third ha I i«l O I'll 111 M. et B. 



18. Abdomen of male with long, erect, blunt hairs, especially thickly placed 



near the tip, costal vein reaching about to the middle of the wing, 



with very long cilia, black, except palpi and legs- . . rufipes Meig. 



Abdomen destitute of such hairs, bare, or nearly so 19. 



19. Proboscis of female normal 21. 



Proboscis of female exserted and enlarged 20. 



20. Proboscis much swollen and enlarged, very fleshy, palpi black, shining black 



species with light yellow legs.. rostrata M. et B. 



Proboscis projecting, stout and horny, third antenna) joint of male enlarged. 



oat a M. et B. 



21. Posterior tibiae strongly ciliated above with bristles 23. 



Posterior tibiee not, or very obsoletely ciliated above 22. 



22. Costal vein extremely short, reaching only one-third of the length of the 



wing; first, second and third veins ending very close together. 



pygma?a Zett. 

 Costal vein longer, distinctly more than one-third the length of the wing. .24. 



23. Wings infuscated m in ill a Aid. 



Wings hyaline f'urtiva Aid. 



24. Costal vein with long cilia 25. 



Costal vein with short, thickly placed cilia, reaching to the middle of the 



wing nigriceps Lw. 



25. Costal vein reaching to the middle of the wing, legs yellowish or piceous. 



pulicaria Fall. 

 Costal vein not reaching to the middle of the wing 26. 



26. Tip of first vein midway between humeral cross-vein and tip of third. 



setacea Aid 

 Tip of first vein much nearer to tip of third vein than to the humeral cross- 

 vein 27. 



27. Thorax shining, four distinct proclinate bristles agarici Lint. 



Thorax dull, only two distinct proclinate bristles, the other pair very small. 



albidohalteris Felt. 



Aphiochrcta epeira? Brues. (Plate iv, fig. 25.) 



1902. Brues, Psyche, p. 351. Fig. 

 Female. Length 3-3.5 mm. Bather broad and stout, almost wholly yellow. 

 Abdomen quadrimaculate with black. Front shining, delicately punctulate and 

 with a few black hairs; twice as high as broad ; with a lateral row of four bris- 

 tles, the vertex with four bristles arranged at the corners of a square between 

 the lateral rows; four anterior proclinate bristles also present. Ocellar tubercle 

 absent, no median furrow on the front. Antennas luteous, except the third seg- 



