SCENOPINIDAE OF THE WORLD 153 



third segment pubescent, oval, twice as long as wide and truncated 

 on the end. 



Thorax dorsum black with a few sparse hairs, humeral callus red- 

 brown; pleural area dark red-brown; wing milk}^ hyaline, veins tan; 

 cell R5 sharplj' narrowed at end (see figure), distance from r-m to 

 m cross vein twice as long as r-m; halter stem red-brown, knob tan 

 to cream yellow. Legs: femora and tibiae dark red-brown with yellow- 

 brown knee, tarsi straw yellow, darkening distally. 



Abdomen dark red-brown, segments 3-5 with broad white stripes; 

 segments with a few lateral white hairs; ninth tergite black-brown, 

 cup of ejaculatory syringe blackish, aedeagus with a strong penis 

 flanked by weak parameres, ninth segment claspers pointed. 



Female. — Head black; eyes red-brown with a narrow postocular 

 rim; frons broad, slightly swollen above the antennal bases, rugose, 

 with shallow grooves either side of median ridge; ocellar tubercle 

 shallow, set off; ocelli red-brown. Mouthparts brown, as in male; 

 oral opening bordered by brown pile as in male. Antennae as in male. 



Thorax dorsum and pleurum as in male; wings hyaline tinged 

 brownish, veins brown; halter stem red-brown, knob orange-yellow. 

 Legs with femora and tibiae dark red-brown, knees yellow, tarsi 

 orange-yellow, darkening distally. 



Abdomen dark red-brown, eighth segment with posterior margins 

 of both sternum and tergum excavated; see figure for details of 

 eighth segment and bursa. 



Length: Alale body 2-2.5 mm., wing 1.5-2 mm.; female body 2.8 

 mm., wing 2.2 mm. 



Type-locality: Espirutu Santo (island). Gulf of California, Mexico 

 (24°30' N. 110°40' W.); 23 March 1953 (P. H. Arnaud) Sefton Orca 

 Exped. to Gulf of California. 



Holotype: Male (CAS) 8928. 



Allotype: Female Isla Partida, Gulf of California, Mexico (24°30' 

 N. 110°40' W.); 23 March 1953 (P. H. Arnaud) Sefton Orca Exped. 

 to Gulf of California (CAS). 



Paratypes : 2 cf cf same data as type (CAS) . 



105. Scenopinus serratus, new species 



Figure 103 



Male. — Head black-brown; eyes amber brown above, brown below ; 

 frons small, triangular, extending over halfway to the median ocellus, 

 with a median groove below ending in a central pit, ocellar tubercle 

 red-brown, prominent, set on back top of head, ocelli clear; mouth- 

 parts creamy, palpi red-brown ; lower part of gena narrowly developed. 

 First segment of antenna small, red-brown; second segment orange- 



