42(3 Mr. R. E. Tuhut on 



attingente fuscis ; cellula brachiali secunria apice leviter infus- 

 cata : capite maximo, vertice fortiter bituberculato. 

 Loug. 14 mm. : terebioe long. 12 mm. 



? . ^Mandibles broad, with two apical teeth, the outer one 

 long, the inner one very short, above the inner tooth the 

 edge of the mandible is broadly rounded. Second jf)int of 

 flagellum about two and a half times as long as the fiist, 

 third a little more than half as long again as the second. 

 Clypeus rather sparsely punctured, front minutely and 

 very closely punctured. Head massive, subquadrate, 

 strongly produced behind the eyes, cheehs distinctly longer 

 than the sca|)e, temples distinctly broader than the eyes; 

 posterior ocelli as far from each other as from the eyes and 

 nearly three times as far from the hind margin of the head. 

 Vertex produced posteriorly on each side into a large, 

 upright, blunt tubercle. Behind each of the posterior 

 ocelli, and separated from them by the same distance that 

 separates them fi'om the anterior ocellus, is a minute 

 tubercle, which at first sight resembles a minute ocellus. 

 Thorax without spines or tubercles ; neck short ; meso- 

 notum and scutellum strongly transversely striated ; prae- 

 scutum concave in the middle anteriorly ; mesopleurae less 

 strongly striated ; postscutellum coarsely longitudinally 

 "striated, median segment coarsely and irregularly trans- 

 ' versely striated, bluntly produced above the insertion of 

 the abdomen. Tarsal ungues with a row of four teeth, 

 excluding the apical tooth. Abdomen stout, the first 

 segment very strongly broadened from the base, third and 

 following tergites clothed with very delicate fulvous pubes- 

 cence. Second abscissa of the radius half as long again as 

 the first; second transverse cubital nervure incomplete; 

 nervulus distinctly postf ureal ; first recurrent nervure 

 received by the first cubital cell at a distance equal to half 

 the length of the first abscissa of the radius before the first 

 transverse cubital nervure. Terebra and valvulse black. 



Hab. Vien Pouklia, Upper Mekong (li. Vitalis de Salvaza), 

 May 11, 1918. 1 ?. 



Easily distinguished from other species of the genus by 

 the extraordinary form of the head. Aiilacus bituberculntus, 

 Cam., has similar tubercles on the head, and is probably 

 related to this species, though Cameron says that it belongs 

 to Aulacinus, having three cubital cells. 



