140 MR. ROBERT MCLACHLAK ON 



if examined only as a fragment, would scarcely be suspected. I 

 liad then received only female images ; and an account of them 

 (with a wood-cut) was published almost simidtaneously in the 

 Entomologist's Monthly Magazine for October 1874, vol. x. 

 pp. lOS-110. I have nothing to add to the generic diagnosis of 

 the 2 imago there given, excepting to indicate that instead of the 

 7th to the 9th abdominal segments only bearing the lateral cor- 

 neous dilatations, the 6th to the 9th are really so furnished, a 

 fact of which I was before doubtful, as indicated by a foot-note. 



Recently I have received a further supply of the insect from 

 Mr. Wakefield, and this time including males and the female 

 subimago, before unknown to me. The male has, as I suspected, 

 its eyes simple (as in the female), and very much longer anterior 

 legs (a usual character in the family) ; but the abdomen is not 

 much less robust than that of the female, and the middle tail is 

 scarcely more abbreviated. The penultimate ventral segment 

 carries a pair of 5-jointed forcipate appendages *. 



I proceed to give an amended generic diagnosis of the female, 

 and add thereto that of the male. 



Oniscigaster. 



($ Imago.') Corpus elongatum, valde robustum. Alae quatuor ; 

 posticae sat latse, ovales ; omnes venulis transversalibus ubique 

 (auticEe apicem versus minus dense) regulariter reticulatse. 

 Pedes antici reliquis vix longiores ; tarsi omnes 5-articulati, 

 subsequaliter biunguiculati, posticorum articulo 4" brevi sed 

 valde distincto. Abdomen valde elongatum et robustum ; 

 segmentis 6°-9° utrinque conspicue corneo-alatis, acute pro- 

 ductis ; ultimo parvo, elongate, obtuso-conicali : ovivalvula 

 nulla : caudse tres elongatee, sed mediaua cseteris gracilior et 

 brevior. 



( cJ Imago.) Oculiutin $ integri. Pedes antici valde longiores. 

 Cauda mediana paullo brevior. Abdomen infra segmentum 

 nonum appendicibus forcipatis 5-articulatis instructum. 



lu its specific characters the male agrees with the female per- 

 fectly in coloration. The forcipate abdominal appendages are 



* Fire joints are unusual, four being the normal number ; but it appears to 

 me that the so-eallecl second joint actually eiists, and is defined by a suture. 



