240 



ME. R. M'LACHLAN ON A SYSTEMATIC 



vitreae ; striga interrupta in dimidio apicali, punctisque nonnullis 

 discalibus basin versus, fuscis; pterostigmate albido, intus fusco- 

 notato; venis venulisque plerumque flavis, nonnullis nigris ($). 

 Long. corp. 14'"; exp. alar, antic. 47"', postic. 43"'. 



Genus Idricerus, n. g. 



Wings elongate, rather narrow, slightly dilated in the middle, 

 apex subacute ; anterior pair with a semicircular excision at 

 the extreme base of the inner margin, followed by a small ob- 

 tusely angular dilatation, and afterwards shallowly excised, 

 not appendiculate ; network moderately open. 



Antennae shorter than the wings, straight; club very large, 

 broadly and shortly pyriform ; a dense tuft of hairs on the face 

 and between the antennse. 



Thorax very villose. 



Abdomen shorter than the wings, moderately stout. 



Legs with the spurs of the posterior tibiae scarcely equalling the 



first two tarsal joints. 

 Hob. JSTorth India. 



Allied to Corniodes, but differing from it in the form of the 

 wings, especially at the basal portion of the inner margin, and in 

 the longer and less robust abdomen. 



Species. 



1. I. decrepitus, Walker. (Ascal. decrepitus, Walk. Trans. Ent. 

 Soc. Lond. ser. 2, vol. v. p. 197.) Frons vertexque cinereo-vil- 

 losa ; pilis inter antennas nigris. Antennae pallide navae, nigro- 

 cinctse; articulo basali clavaque nigris. Thorax niger, antice flavo- 

 varius, supra in medio fusco-villosus, utrinque et infra cinereo-vil- 

 losus. Pedes fusci ; tibiis late flavo-bicinctis, nigro-hirsutis ; tarsis 

 nigris, articulo basali ad basin testaceo; unguiculis calcaribusque 

 runs. Abdomen nigrum, paullo cinereo-pilosum ; segmentis duobus 

 basalibus supra testaceo -maculatis. Alae vitreae; venis venulisque 

 nigris, nonnullis nigro-marginatis, flavo-interruptis ; pterostigmate 

 brunnescente, nigro-venato. Long. corp. 12-15"'; exp. alar, antic. 

 32-40"'. 



I have examples from North India, taken in May and June by 

 Capt. A. M. Lang, E.E. 



Walker could not have observed the entire eyes, or he would 

 never have indicated (I.e.) that the species belongs to the group 

 of Ogcogaster (tesscllatus, &c), with which it has no affinity 

 whatever. 



