MONGOMA. 477 



a little beyond the tip of the auxiliary ; tlie 2ud longitudinal vein 

 beginning at the first third of the wing, the prajfurca being two- 

 thirds the length of the vein, the fork very wide, the upper branch 

 approximately at an angle of 45°, the lower branch ending just 

 above or below the wing-tip ; marginal cross-vein very distinct, 

 oblique, leaning backwards, joining the 1st vein just before its 

 tip, and the 2nd vein just before it forks ; the 3rd vein appearing 

 almost as- a continuation of the first section of the 2nd vein, that 

 IS to say, it emerges at the first third of the 2nd vein, losing itself 

 in the 4th longitudinal v(nn at the upper basal corner of the 

 discal cell ; the anterior cross-vein is therefore absent. Upper and 

 lower branches of the 4th longitudinal both forked, the veinlets 

 parallel {pennipes) or gently diverging (fragillima). The 1st 

 posterior cell is absent, through the absence of the anterior cross- 

 veiu, the uppermost of these cells is therefore the 2nd, which, 

 with the 4tl), is pointed at the base {fra(jillinia), or approxi- 

 mately rectangular {jyennipes). Discal cell longer than broad, 

 hexagonal ; posterior cross-vein at or just before the base of the 

 discal cell, short ; 5th vein bent suddenly downwards at its junc- 

 tion with the posterior cross-vein, until it meets the 6th vein 

 (which is nearly straight) before its tip, closing the anal cell; 

 7th vein very short, gently curved.* 



Range. As restricted by me, the genus occurs in Tropical Africa, 

 Madagascar, iiorneo, Philippine Islands, India and Ceylon. 



Mr. Edwards resurrects Bigot's genus Trentepohlia to take the 

 place of Mongoma, but this genus cannot stand, being insufficiently 

 characterised ; in fact, its simple inclusion in a table with such 

 incongruous material as Dixa (a separate family), Ptychoptera, and 

 Bolichopeza (the latter appearing a second time as Apeilesis\ both 

 representing totally different subfamilies ; with such genera as 

 Anisomera, Ula, Erioptera (as Octavia), each belonging to a dif- 

 ferent section of Limnobiin.e, and finally \^'ith " Ligonevra " 

 ( = Lygoneura,'Mg., belonging to the Mycetopkilid.5: !), is most 

 certainly no characterisation ^^-hatever. Moreover, the. nomi- 

 nation of a type species in itself does not, in my opinion, 

 constitute a generic diagnosis. 



As M. frag iUi ma, Westw., v.-as the original type oi Mongoma, 

 Westw., ihat species must of course remain the type of the 

 restricted Mongoma. Two other Oriental species belong here 

 also, tenera, Os. Sac, and pennipes, Os. Sac, the former from 

 the Philippines and India, the latter from Borneo, India, and 

 Ceylon. 



Out of the material previously comprised in Westwood's genus 

 Mongoma, I established recently t two additional genera, Para- 

 mongoma and Mongomioides, based on well-defined and apparently 



* Westwood does not mention the 7th vein in his description, though it is 

 clearly shown in the plate. 



t FifZc Rec. Ind. Mus. vi, p. 291 d secj., for full discussion of the three 

 genera in detail. 



