COLLECTED IN BORNEO, ETC. 87 



ferruginous ; wiugs brown, and iridescent. Abdomen shining, punc- 

 tured, and having purple and blue tints in different hghts ; a narrow- 

 fascia on the apical margin of the first segment and a broader one on 

 the second and third, of snow-white short dense pubescence ; the 

 margins of the apical segments fringed with long black pubescence. 

 Hab. Borneo (Sarawak). 



14. Mutilla unimaculata. M. capite abdomineque nigris ; thorace 

 ferrugineo ; abdominis segmenti secundi basi macula ovata, seg- 

 mento tertio fascia lata alba pubescente. 



Female. Length 6 lines. Black ; the thorax ferruginous, and coarsely 

 rugose. Head sprinkled with dark brown hairs, eyes large and ovate ; 

 the clypeus and scape with whitish hairs. Thorax oblong-quadrate, 

 slightly narrowed posteriorly ; the disk with short reddish-brown pu- 

 bescence at the sides ; beneath and on the legs it is of a glittering 

 silvery-white ; the metathorax with long thin pale pubescence ; an 

 ovate spot at the base of the second segment, and the third segment 

 clothed with dense short white pubescence, in the middle at its base, 

 a triangular black shape ; beneath, the apical margins of the second, 

 third and fourth segments with white marginal pubescent fasciae. 



Hab. Borneo (Sarawak). 



Gen. Mybmosida, Smith. 



Head subquadrate; stemmata in a triangle on the vertex; eyes large, 

 round and lateral ; antenna subfiliform, inserted at the base of the 

 clypeus, not closely approximating ; the clypeus triangular ; mandibles 

 triangular. Thorax : longitudinally quadrangular, the sides slightly 

 rounded ; the posterior margin of the prothorax curving backwards to 

 the origin of the wings ; the tegula? small ; the superior wings with 

 one marginal and two submarginal cells ; the first submarginal re- 

 ceiving the first recurrent nervure. Abdomen : ovate, the two basal 

 segments forming distinct nodes, the first subquadrate, the second 

 node widening towards the apex and again narrowing at one fourth 

 from the apex. 



The insect from which the above characters are drawn being a 

 male, there can be little doubt that when the other sex is discovered 

 the generic characters will require a complete revision ; in the 

 neuration of the wings this genus very closely approaches that of 

 Mutilla, the males of which have the third submarginal cell fre- 

 quently obliterated, and the form of the abdomen often very ec- 

 centric ; the form of the eyes also varies, from being deeply emar- 

 ginate or reniform, to being round and very prominent. The 

 situation of the present genus I think must be next to Myrrnosa : 



