E. T. CRES80N, JR. Ill 



thorax is also more polished although faintly furrowed ; the knobs 

 of halteres entirely white. Size about the same. 



Sceiiopinus iiiibilipes Say, PI. II, fig. 2. 



This is a somewhat smaller species. The male has never before 

 been described, and is so different from the female, that one is very 

 liable to take it for a new species. I have seen a pair in the U. S. 

 Nat. Mus. collection which were taken in copula. 



Much smaller than S. fenedralis, which it resembes, and the third 

 and fourth veins become distinctly parallel a short distance before 

 they enter the costa ; the femora, except the knees, black ; the last 

 section of the third vein about three fifths as long as the preceding 

 section. 



Before me are two males and one female from Alamogordo, New 

 Mexico (Rehn and Viereck). Of the males I give the following de- 

 scription : 



Head entirely black. Eyes very large, contiguous from the prominent ocellar- 

 tubercle to near the antennae, leaving a frontal triangle about as long as the sec- 

 ond antennal joint; the line of separation of the facets about on level with the 

 antennse. P"'ront poUinose, with a narrow median furrow. Face and cheeks very 

 narrow. Occi|)ut flat or slightly coiivexed. Antennse black, pollinose, situated 

 below the center line of the eyes; third joint three times as long as the second. 

 Palpi and proboscis black. 



Thorax black, semi-opaque, clothed with minute scattered white hairs; a mi- 

 nute brown spot behind each humeral callus; the post-alar calluses brownish. 

 Pleura brownish. Scutellum black, semi-opaque. Halteres brown, with white 

 knobs. Squamulffi white. 



Abdomen blackish-brown, shining, clothed with scattered whitish hairs; two 

 elongated velvety-black spots on the dorsum of the second segment; dorsum of 

 third to fifth segments totally white, or sometimes the posterior margins only 

 whitened. 



Legs blackish-brown, but the knees of all femora, the bases, especially of the 

 hind tarsi, yellowish. Wings hyaline; veins yellowish, darker towards their 

 bases; the last section of the third vein three-fifths as long as the preceding 

 section. Length ranging from 2.5-4 mm. 



Scenopiniis albidipennis Lw., Cent., VIII, 53. 1869. 



"Male. — Black; head and thorax subopaque; abdomen shining, the posterior 

 margins of the intermediate segments white; antennse black; legs black, except- 

 ing the entire anterior and apices of posterior tibiae and all tarsi brownish ; hal- 

 teres white, pedicel black; wings whitish-hyaline, with the first three veins yel- 

 low, the remaining veins brownish, not clouded. Length 1.5 lin." 



Hub. — Cuba. 



TKANS. AM. ENT. SOC. XXXIII. APEIL. 1907. 



