Australian Gistelidaf.. 87 



Bubdominant but evident (in certain lights) vittae in insularis. 

 (These are often very obscure). .But there is no doubt of their 

 identity. I have compared these with the type of //. subvittata, 

 Macl., ;uul find them identical. The species of Hybrenia are in 

 genera] readily distinguished by their very strongly individualised 

 sculpture. There is a concolorous black species in N. Queensland 

 not to be otherwise distinguished from //. vittata, which I have 

 named //. vittata var. concolor. 



II . grandis, Borch. — I think I have correctly identified this species 

 from the description. 1 have only seen three specimens; a pair (the 

 sexes) in the Melbourne Mus., from Victoria, and ;i $ in my own 

 coll., taken by myself at Medlow, Blue Mountains. The sexual 

 differences are well defined, as stated by the author, the $ having a 

 triangular enlargement on the fore tibiae. Borehmann gives West 

 Australia as the locality, but this seems open to question, i.e., assum- 

 ing my determination to be correct. 



Hybrenia rugicollis, n. sp. 



Elongate, ovate (<? sometimes slightly obovate). black subnitid 

 (head and prothorax subopaque), oral organs, antennae and tarsi 

 piceous. Head and pronotum densely rugose punctate, eyes large, 

 prominent and subapproximate (about .8 mm. apart in $ ahout 

 1.2 mm. in the 2), antennae long, joint 1 stout, 2 very short, 3 

 half as long again as 4, 4-11 successively shorter than preceding, 

 labrum with castaneous fringe, maxillary palpi with last joint 

 triangular. Prothorax convex, about as long as broad, widest at 

 middle, slightly wider at base than at apex, bisinuate at both, the 

 anterior angles widely rounded and slightly advanced, sides 

 well rounded, feebly sinuate near the subrectangular and well- 

 marked posterior angles, with raised margins throughout, but 

 lateral margins not evident from above; disc with slight medial and 

 a transverse basal depression. 



Scutellum very large, scarcely, or very finely, punctate, widely 

 rounded behind. Eh/Ira considerably wider than prothorax at 

 base, and about three times as long, subparallel or slightly obovate, 

 sulcate punctate, with a short seutellary and nine other rows of 

 large square punctures, placed in wide sulci and separated by sub- 

 cancellate ridges, continuous, with little difference of size to the 

 extreme apex, the 4th and 5th connected before the apex; intervals 

 rather sharply ridged and smooth; underside very coarsely and 

 rather" closely punctate, except the two apical segments of abdomen, 



