148 U.S. NATIONAL MUSEUM BULLETIN 2 77 



Thorax dorsum black, rugose, only a few very fine hairs along lateral 

 margin of tergum; humeral callus with a small posterior patch of 

 yellow-brown; pleural areas black-brown; wings hyaline to milky, 

 veins pale tan, faint; halter stem black, knob white. Legs with femora 

 red-brown, tibiae orange-brown, tarsi straw colored darkening 

 posteriorly. 



Abdomen dark red-brown, shining, segments 4 and 5 with narrow 

 white posterior bands, all segments with short reddish hairs. See figure 

 for details of ninth tergum and genital structures. 



Female .^ — Head black, eyes black-brown, with a narrow postocular 

 ridge; frons swollen above antennae, with swelling divided by a deep 

 median groove ending in a pit in the lower third of the frontal area, 

 remainder of frons rugose; ocellar tubercle flat, rugose; median ocellus 

 sunken, ocelli red-brown; mouthparts brown, well developed; palpi 

 black-brown, long; oral opening bordered by silvery pile which extends 

 over the antennal bases below the swellings on the frons. Antennae as 

 in male except third segment thickened at base, velvety. 



Thorax dorsum black, rugose, a patch of white pubescence anterior 

 to the humeral callus, a few fine hairs on lateral margin; pleural areas 

 dark red-brown; wings brownish hyaline, veins brown; halter stem 

 red-brown, knob white to creamy. Legs with femora red-brown, tibiae 

 red-brown lightening posteriorly, tarsi light red-brown anteriorly 

 lightening to tan posteriorly. 



Abdomen red-brown; see figure for details of the eighth segment 

 and bursa. 



Length: Male body 2.3-2.8 mm., wing L7-2.3 mm.; female body 

 3-3.5 mm., wing 2.3-2.6 mm. 



Type-locality: Surinam. 



Type: (ZMH). 



Material examined: Icf, Cuba (Gundlach) as type of S. albidi- 

 pennis Loew (MCZ) no. 1086; 1 d^, Mina Carlata, Trinidad Mt., Cuba, 

 11-16 July 1939 (C. T. Parson) in (MCZ) ; Id', 3 99, Mazaruni Qearing, 

 British Guiana, 9 July, 15 and 21 September 1937, in colony house 

 (Richards and Smart) (BMNH); Id", 19, La Suiza de Turrialba, 

 Costa Rica (Pablo Schild) Higuito, San Mateo, Costa Rica, (Pablo 

 Schild) (USNM); Idd, 15 99, Palisades, Kingston, Jamaica, No- 

 vember 1957, February and September 1958, July and August 1964 

 (T. H. Farr) (SMI J). 



102. Scenopinus rossi, new species 



Figure 100 



Male. — Head black-brown; eyes dark brown above, red-brown 

 below; frons with lower half smooth shining, bordered on each side by 

 the dorsal extension of lateral silvery pubescence surrounding the oral 



