248 BRITISH GUIANA TIPULIDAE 



postnotum brown. Pleura dull yellow. Halteres brown. Legs, the fore 

 pair lacking; middle pair, coxae and trochanters pale dull yellow, femora 

 brown the tip abruptly white, extreme base of the tibia white, the remainder 

 brown, tarsi brown; hind pair with the coxae and trochanters dull yellow, 

 femora brown with the tip broadly white, tibiae with the base narrowly 

 and rather indistinctly white, the tip broadly white, tarsi white, the two 

 terminal segments more browned. Wings subhyaline, the stigma dark 

 brown ; tip of the wing and most of the veins and deflections of veins and 

 cross-veins seamed with gray. Venation, see plate IV, fig. 8. 

 Abdominal tergites dark brown; sternites pale yellowish brown. 



Hahitat.—Mal\a\i, March 8, 1913. 

 Holotype, d", Mallali, March 8, 1913. 



The described species of Mongoma belonging to the bromeliadicola 

 group may be separated by the following kej^ : 



1. Femora not tipped with white. (For these species, see Proc. U. S.Nat. 



Mus., xliv, 500.) 

 Femora tipped with white 2 



2. AA ings without gray seams to the veins ; cross-vein r rather far before the 



fork of R2+3', tips of all the tibiae yellowish white, tarsi brown. 



(Costa Rica) bromeliadicola Alexander'* 



Wings with the veins seamed with gray; cross-vein r just before the fork 

 of Ri+3', tibiae either uniformly brown beyond the base or else 

 only the hind pair tipped with white 3 



3. Wings infumed with gray at the apex; hind tarsi white; white tips to 



the light brown femora broad. (British Guiana) . .pallipes sp. n. 



Wings not infumed at apex; all the tarsi brown; white tips to the dark 



brown femora narrow. (British Guiana) geniculata sp. n. 



Tribe Limnophilim 



Genus PSARONIUS Enderlein 



1912. Psaronius Enderlein, Zool. Jahrb., xxxii, pt. 1, 50. 



1913. Lecteria Alexander, Proc. U. S. Nat. Mus., xliv, 493. 



In an earlier paper cited above I did not consider this genus as 

 being distinct from Lecteria Osten Sacken. A very considerable 

 amount of new material has since come to hand and it now appears 

 as though the two genera are analogous forms of their respective 

 tribes, Lecteria being an Eriopterine with spurless tibiae, while 

 Psaronius is a Limnophiline with spurred tibiae. The venation of 

 the members of these genera is very similar and their true relation- 

 ships will only be explained when the immature stages are dis- 

 covered and the forms reared; since Lecteria armillaris Fabricius 



'* 1912. bromeliadicola Alexander, Entomological News, xxiii, 415 to 

 417. 



