250 BRITISH GUIANA TIPULIDAE 



Thoracic notum light brown, dorsal stripes not apparent; the postnotum 

 darker brown medially. Pleura rather pale, brownish yellow. Halterep 

 brown, the extreme base pale. Legs with the coxae and trochanters rather 

 bright yellow; femora brown, only the tips slightly darkened; tibiae brown, 

 the tip narrowly dark brown; fiist tarsal segment very pale, almost white, 

 remainder of the tarsus brown. Wings with a pale yellow suffusion, the cos- 

 tal cell brighter yellow; brown clouds at the origin of Rs, fork of ^2+3 and 

 the. radial cross-veins and deflections of veins narrowly and indistinctly 

 seamed with brown; cephalic half of the long cell 7^2 infumed. Venation: 

 (see plate IV. fig. 9) R2 tending to atrophy, its tip fused with Ri at the 

 wing-margin. 



Abdominal tergites light brown, beyond the third segment darkening 

 into a deeper brown; sternites yellow, the apical segments darker. 



Habitat. — Bartica, January 30 to February 21, 1913. 



Holotype, cf, Bartica, February 21, 1913. 



Paratype, cf, topotypic, January 30, 1913. 



This form is the smallest of the described species with the 

 exception of ohliteratus Alexander; the forms may be separated by 

 the appended key. 



A Key to the Species of Psaronius Enderlein 



1. R2 entirely atl-ophied; cell 2nd /?, entirely obliterated. (Paraguay) 



ahnormis Alexander'' 

 Ri present, at least basally; the tip may be fused with Ri at the wing 



margm. 



2 



2. Ri fused with Ri at its tip so that cell 2ncl Ri is very tiny, pointed at its 



distal end which does not attain the wing-margin 3 



R2 free for its entire length, running sub-parallel to Ri and R3 so that 

 cell R2 is long, slender, its distal end at least as broad as its prox- 

 imal end and attaining the wing-margin 4 



3. Smaller; wing of male less than 12mm. ; wing suffused with brown; body 



coloration dull black; antenna! flagellum black, the scape orange. 



(British Guiana) obliteraius Alexander*" 



Larger; wing of male over 12 mm. ; wing pale yellowish; body coloration 

 orange-yellow; antennal flagellum brown, only the first segment 

 orange. (British' Guiana) pygmaeus sp. n. 



4. Wings light yellow or brownish yellow; body coloration ochraceous yel- 



low, the markings rather indistinct. (Guiana; Brazil) 



obscurus Fabricius'" 



Wings dark brown; body coloration brown, the marking dark brown. 



(British Guiana) fuscipennis sp. n. 



'9 1914. abnnrmis Alexander, Ent. News, xxv, 211, pi. ix, fig. 9 {Leclcria) . 

 40 1913. oblilerata Alexander, Proc. U. S. Nat. Mus., xliv, 494 {Leclcria'). 

 ••i 1805. o?).sa^m Fabricius. Syst. Antl., 27 (r?7)?//a). 



