36 ME. F. SMITH ON HYMENOPTEEOUS INSECTS 



Male. Length 7 lines. Black, and with a fine thin cinereous pubescence ; 

 the clypeus and inner orbits of the eyes with a dense silvery pubes- 

 cence, the lower portions of the cheeks silvery ; the palpi pale testa- 

 ceous; the mandibles pale ferruginous. Thorax: the wings hyaline 

 and beautifully iridescent, the nervures fuscous, the tegulae testaceous; 

 the meso- and metathorax finely punctured, the latter shining, with a 

 dense silvery pubescence at the sides ; in the centre a deep longitudi- 

 nal impression, deepest in the middle ; the articulations of the legs 

 rufo-piceous ; the tarsi rufo-testaceous. Abdomen : the petiole slen- 

 der, longer than the three following segments ; the margins of the 

 apical segments narrowly rufo-piceous. 



Hab. Mysol. 



Gren. Aepactophilus. 



Head large, subquadrate, wider than the thorax; eyes oval, distant, 



placed at the sides of the head ; anteunaj geniculated, scarcely longer 



than the head, inserted at the base of the clypeus, not approximated; 



the fiagellum subfiliform, the first joint small, half the length of the 



following joints, which are cylindric and nearly of equal length ; the 



scape short, shghtly thickened towards the apex, and about the length 



of the five basal joints of the fiagellum ; the mandibles bidentate at 



their apex. Thorax ovate; the collar transverse; the scutellum 



transverse; [the metathorax with an enclosed space at its base; the 



superior wings with one marginal cell, narrowing beyond the second 



submurginal and subacute at its apex : submarginal cells two, the first 



oblong, receiving at its apex the first recurrent nervure, the second 



angular, truncate at its apex ; discoidal cells two ; legs moderately 



strong, simple. Abdomen subsessile, incurved at its extremity. 



This genus is closely allied to Diodontus, from which it difi'ers in the 



neuration of the anterior wings, in wanting the second recurrent nervure, 



and in the bidentate mandibles, but in general habit it bears a close 



resemblance to that genus. 



1. Arpactophilus bicolor. a. uiger, pedibus abdomineque ferru- 

 gineis, alis fuscis. 



Female. Length 3| lines. Head and thorax black, and sculptured with 

 a coarse deep longitudinal striation, the strife in parts running into a 

 very coarse punctation ; on the front of the head,' above the insertion 

 of the antennae, it is transverse ; the metathorax with a semicircular 

 space at its base, enclosed by a slightly elevated ridge ; above the an- 

 tennae is a central elevated carina, which terminates before reaching 

 the anterior ocellus ; the antenna, mandibles, an d legs ferruginous, 

 the coxffi, trochanters, and femora beneath black ; the palpi pale tes- 

 taceous. The wings fuscous, palest at their apical and posterior mar- 

 gins. Abdomen shining, ferruginous, smooth and impunctate. The 

 male differs in having the scape white in front. 



Hub. Mysol. 



