242 



MB. R. M'LACHLAN ON A SYSTEMATIC 



G-erms Tmesibasis, n. g. 



Wings elongate, the basal portion of the inner margin very 

 strongly excised and petiolate, longly appendiculate in the 

 anterior pair : after the narrow base rather broadly dilated 

 and nearly oval, acute at the apex : network rather open ; 

 branch of the lower cubitus confluent with the postcosta in all 

 the wings. 



Antenna much longer than the wings, furnished with verticillate 

 hairs at the base : club extremely long and slender. 



Thorax scarcely villose. 



Abdomen slender, shorter than the wings (without appendices in 



the tf?). 



Legs with the spurs as long as the first three tarsal joints. 

 Ilab. Mozambique. 



Founded on a single species, Ascal. laceratus, Hagen, which I 

 have not seen : the characters have been drawn up from Hagen' s 

 careful description and beautiful figure. A very sharply defined 

 genus, without a parallel among the Holophthalmi ; the formation 

 of the antenna? approaches that of Colobopterus among the Schi- 

 zoplitlialmi. 



Species. 



1. T. lacerata, Hagen. (Ascal. laceratus, Hag., Peters's Reise nach 

 Mossamb. p. 92, pi. v. fig. 3.) 



Division II. Schizophthalmi. 

 Genus Cordulecertjs, Bambur. 

 (Suphalasca, part., Lefebv., Hag.) 



Wings ample, usually broad, but varying much. Anterior pair 

 with an evident excision at the extreme base of the inner mar- 

 gin, not appendiculate, dilated in the middle, inner margin con- 

 tracted at the point where the cubiti terminate ; apex acute 

 posterior pair with the anal portion of the inner margin ordi- 

 narily deeply sinuate in the <$ , slightly sinuate in the 2 , 

 broad at the anal portion, contracted at the termination of the 

 cubiti, no transverse branch of the lower cubitus ; postcosta 

 strongly sinuous : network open. 



Antennce as long as the wings, the extreme base with a few verti- 

 cillate hairs ; club elongately spoon-shaped ; a very dense tuft 

 of hairs between the antenna?. 



