and Species of Heteromera. 23 



From H. fenuistriata, with which it is most closely allied, it 

 may be separated by the above characters, and also by its 

 more slender form, the gular furrow placed less close to the 

 submentum, the absence of the short longitudinal groove from 

 base of submentum, the cheek-furrow shorter and more or less 

 recurved round the lower (narrow) edge of the eye beneath. 



Out of the whole of the examples of both sexes I possess of 

 this species but one has the mentum clothed with hairs ; this, 

 coupled with what we have seen before in the other species, 

 makes it quite evident that the bearded chin possesses neither 

 specific nor even sexual value. 



Hypaulax gayndahensis and H. opacicollis^ MacLeay, 

 Trans. Ent. Soc. N. S. Wales, ii. pp. 284 & 285. 



As the descriptions of these two species extend to but little 

 over two lines for each, I find it impossible to decide whether 

 they belong to any of my species or not. In a difficult genus 

 like the present, the species of which are subject to great indi- 

 vidual variation, it is impossible intelligibly to characterize 

 the species in such short descriptions. 



ASTATHMETUS, n. g. 



Mentum slightly pedunculate, winged ; the centi-al portion 

 large, prominent, not wider than long, hexagonal. Maxilke 

 with the inner lobe unarmed ; last joint of the palpi elongate- 

 triangulate, the outer side longest. Labium strongly transverse, 

 partly concealed by the mentum, broadly emarginate and ciliate 

 in front ; palpi distant, the last joint oval, with the apex 

 broadly truncated. GuJa strongly transversely sulcate. 

 Submentum small, transversely triangular, a deep longitudinal 

 sulcus extending from its base to the gular fm-row. Cheehs 

 beneath strongly sulcate, the furrow extending obliquely from 

 the base of the antenna, skirting the upper edge of the eye, to 

 close to the gular furrow. Mandibles broadly truncated, and 

 slightly notched near the lower edge at apex. Head sub- 

 prominent, subquadrate ; front a little depressed ; front and 

 epistoma together trapeziform : antennary orbits well rounded. 

 Epistoma squarely truncated in front ; the suture well marked 

 at each side. Labrum transverse, front angles well rounded, 

 fore margin ciliate and slightly emarginate. Antennce feebly 

 perfoliate ; joints 3-6 obconic and a little nodose at apex, 

 3 longer than 4, 4-6 gradually a little shorter, 7-10 gradually 

 larger and wider, depressed, 1 1 large, subovoid. Eyes moderate, 

 rather prominent, narrow, transverse, obliquely contracted 



