252 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



proboscis as in nigricoxa; eyes bare, oval, but not with the longest 

 axis upright, placed so that their greatest height and length are about 

 equal. Mesonotum with two broad, shallow sulci, unpunctured; 

 surface hairs as in nigricoxa but shorter and more sparse; scutellum 

 broad and short, rounded in outline, the marginal bristles stronger 

 than in nigricoxa in comparison also with the other hairs on scutellum. 

 Legs with the pale surface hairs as in preceding species, the tibial spur 

 similar to that species. Wings with venation as in nigricoxa. 



Length, 1.5-2 mm. 



Type.— Cat. No. 15965, U.S.N.M. 



Type-locality. — Brownsville, Texas, July 16, 1906, "Reared from 

 cotton squares." (No collector's name.) 



Paratypes. — One specimen, Dallas, Texas, "From cotton squares," 

 July 21, 1905 (W. W. Yothers); six specimens, Ruston, Louisiana 

 (W. D. Pierce and H. S. Smith). I have also seen a large series reared 

 from cotton squares, Calvert, Texas, 1902 (G. H. Harris), and speci- 

 mens from the following localities: Victoria, Texas (J. D. Mitchell); 

 Liberty, Texas (E. S. Tucker) ; Logansport, Louisiana (E. S. Tucker) ; 

 and Tampico, Mexico (F. C. Bishopp). 



13. mPPELATES MICROCENTRUS Coquillett. 



Fig. 20. 



Hippelates microcentrus Coquillett, Invertebrata Pacifica, Rep. Cal. and Nev. 

 Dipt., vol. 1, 1904, p. 28. 



Female. — ^Very similar in color to the preceding species, but the 

 legs are very distinctly darker, the yellow color being confined to 

 knee joints, bases and apices of mid tibiae, and bases of posterior two 

 pairs of tarsi. The abdomen shows hardly any traces of yellow at 

 the base, Halteres with yellow pedicel and white knob. 



More elongate than either of the two preceding species. Frons 

 occupying almost one-half the head width; triangle heart shaped, 

 the posterior corners rounded, sides slightly convex, apex acute, 

 occupying two-thirds the width of frons at vertex and extending 

 slightly beyond middle of frons anteriorly; surface hairs regularly, 

 but sparsely, arranged, the space in front of apex of triangle bare; 

 antennae of similar shape to those of texana but rather smaller, the 

 thhd joint with rather more distinct pilosity; arista as in texana, 

 but less distmctly pubescent; cheeks with whitish pollen, equal to, 

 or slightly higher than, width of third joint of antennae, proboscis as 

 in texana. Mesonotum in all the specimens in type series in poor 

 condition, due to pin, but evidently similar to texana; scutellum 

 with four distinct bristles, the middle pair not approximated; upper 

 portions of plurae pollmose, lower highly glossy. Legs slender, 

 femora glossy; surface hairs pale; hind tibial spur curved, short, 



