19 



Allied to the preceding species, and structurally as described, but consider- 

 ably larger, antennae distinctly longer and thinner, each joint being at least 

 twice as long as wide; on the preceding species each of the sixth to tenth 

 joints is not much longer than wide. It is of the size of A. favosus, but is 

 winged. The abdomen is really black, but owing to the clothing has a rust}* 

 appearance. A male belonging to the species is evidently immature, it differs 

 from the type in being of a dingy red, with the tips of elytra and parts about 

 the scutellum obscurely paler; the tip of its subapical segment is triangularly 

 notched. Three specimens were obtained at lights. 



Astenus mandibularis, n. sp. Figs. 12 and 13. 



6 ■ Reddish-castaneous ; mouth parts, mandibles, antennae, palpi, apex of 

 elytra, legs, and most of abdomen flavous, an interrupted fascia on elytra, upper- 

 surface of fourth segment of abdomen, and of part of seventh, black or blackish. 

 Sparsely clothed with short pale pubescence, the sides with rather long dark 

 setae or hairs. 



Head rather large ; with shallow reticulate punctures. Mandibles long and 

 acute, the left one with an acutely bicuspidate tooth before the middle, the right 

 one in addition with a minute tooth beyond the middle. Antennae thin, first 

 joint as long as three following combined, ninth and tenth scarcely longer than 

 wide. Prothorax scarcely longer than the greatest width, which is near apex, 

 sides obliquely narrowed to near base, and strongly rounded to apex, punctures 

 as on head. Elytra distinctly longer and wider than prothorax; with dense 

 sharply-defined punctures and a few obtuse granules. Abdomen less than half 

 the total length, subapical segment triangularly notched almost to base on under- 

 surface. Length, 4.25-4.75 mm. 



Hab. — Queensland: Cairns district (A. M. Lea). Type, I. 12411. 



The elytral fascia is of irregular shape, and touches neither suture nor 

 sides, the space posterior to it is considerably paler than that anterior to it, 

 although the latter is not of so bright a red as the prothorax. In appearance 

 fairly close to some forms of A. hrevicollis, but the dark elytral markings con- 

 fined to a median space (and very conspicuous there), the elytra with fewer 

 subgranular elevations, the prothorax somewhat longer, and only one abdominal 

 segment dark, and that on the upper-surface only. From the description of 

 A. pectinatus it differs in being larger, elytra paler beyond than before the black 

 markings, and the fourth segment of abdomen black. It is much larger than 

 A. guttulus, elytra with black markings irregularly transverse, and their apex pale. 



A female (from North Queensland, Blackburn's collection) differs from the 

 type in having the head and prothorax almost black, the elytra black except at 

 the apex, and the fifth segment of abdomen the only conspicuously pale one; 

 it agrees in many details with the description of A. (Dibelonetes) antipodwm, 

 but differs in the abdomen, although at first glance the three basal segments 

 appear to be as dark as the fourth, in certain lights they are seen to be distinctly 

 less dark. It, and the type (a third specimen has the mandibles clenched) have 

 the mandibles, side for side, exactly alike. 



Astenus ambulans, n. sp. Fig. 14. 



$ . Pale castaneous ; antennae, palpi, and legs flavous, basal two-thirds 

 of fifth segment of abdomen black. Very minutely pubescent ; the sides with 

 sparse black setae, becoming numerous about apex of abdomen. 



Head rather large ; with shallow reticulate punctures. Mandibles long and 

 acute, each near middle with a long acute tooth, and which has a minute basal 

 projection. Antennae thin, some of the median joints not much longer than 

 wide. Prothorax very little longer than the greatest width, which is near apex, 



