INSECUTOR INSCITI^ MENSTRUUS 85 



at the tip and radially marked, without any joint as occurs in 

 the harpago at the insertion of the filament. 



Group IV. — Side piece with a basal lobe, possibly as a de- 

 velopment of the basal membrane ; harpes and unci moderate ; 

 clasp filament generally with a long row of inserted spines 

 {Armigeres) } 



Group V. — Side piece with a basal lobe, sometimes rudi- 

 mentary, derived at the base of the side piece ; clasp filament 

 often modified; harpes and unci not strongly modified; har- 

 pagones absent (Ecculcx, Aedimorphus and Diceromyia) . A 

 skeleton table of the species would run as follows: 



1. Clasp filament inserted terminally 2 



Clasp filament inserted subapically luteolateralis Theobald 



2. Filament entire, the spine subapical vexans Meigen, 



(de-ntattis Theobald), (hirsutus Theobald), (cumminsi Theobald) 

 Clasp filament further modified 3 



3. Filament simply cleft (punctithorax Theobald) 



Filament divided, one arm hooked and toothed, 



(abnormalis Theobald), (alboventralis Theobald) 

 Filament expanded and lobed, with two terminal spines, 



(niinutus Theobald), {tarsalis Newstead), (irritans Theobald) 



Group VI. — Clasp filament apparently absent or at least 

 modified out of all homology, inserted subapically, without 

 terminal spine; basal lobe present (in cinereus) ; harpes and 

 unci variously developed; basal membrane modified (Aedes). 



In cinereus Meigen the end of the side piece is rounded and 

 blunt, and apparently this is the case also in butleri Theobald, 

 pseudomediofasciatus Theobald and fragilis Leicester. The 

 other species illustrated by Edwards have the side piece more 

 or less hollowed at tip, the corners drawn inward into spines 

 of various lengths. In ceylonicus Edwards the clasp filament 

 is single and small ; in singularis Leicester it is bent and 

 forked; in virUis Leicester and uncus Theobald there are two 

 long separated processes. Other modifications may be noted 

 in Edwards's figures. 



Certain improvements can be made to the table of genera 

 of the tribe by genitalia, given by us in the monograph (vol. 



' This probably represents a distinct genus, as with Leicesteria Theobald. See 

 Edwards, Bull. Ent. Res., iv, 3.5.5-863, 1914. 



