214 MEMOIBS OF THE QVKKSSLAM) MISKVM. 



which appears on some specimens to extend to th<' base itself, although it does 

 not dt) SO; from the inter-antennary space a wide and uneven elevation jirojects 

 subtriangularly backwards into the excavation, and from directly behind the sides 

 of this elevation appear like two minute tubercles (on foccicops a smaller median 

 one may also be seen). I have repeatedly compared the heads of the males from 

 many points of view, and cannot satisfy myself that the two forms belong to 

 but one species, des])ite the close similarity of all ])arts but the head, and the 

 curiously coloured antennte: the females of the two si)ecies are practically indis- 

 tinguishable. The middle of the l)ase of the head cA' tlie male is usually black, 

 but, as that part is normally concealed, the head appears to be entirely pale ; the 

 antenna' are usually entirely pale, but with the middle joints slightly darker than 

 the others, but sometimes much darker; the tarsi and middle and hind tibiae 

 are usually distinctly infuscated; on the female the tip of the antenmp is some- 

 times black, but is usually obscurely paler than the preceding joints. The head 

 of the male is densely punctate, but the punctures are not sharply defined, its 

 prothorax also has fairly numerous punctures towards the sides; on the female 

 those of the prothorax are more distinct but scarcely larger. 



HELCOG ASTER TRIFOVEICEPS sp. no\ . 

 $ Flavous; scutellum, abdomen (except tips of segments on upper 

 surface), mesosternum, metasternum, apical half of antenna\ and parts of legs, 

 black or infuscated. With sparse, white pubescence ; denser on head and abdomen 

 than elsewhere. 



Head wide, with a rather deep, transverse, interocular depression, its 

 posterior margin trisinuate; front with an obtuse elevation having two small 

 tubercles posteriorly. Antennas moderately long. Prothorax distinctly trans- 

 verse, base much narrower than apex, near base with a large, deep, closed, 

 transverse depression ; punctures rather dense on sides, sparse elsewhere. Elytra 

 rather short, dilated posteriorly ; with sparse, small, rugulose punctures. Basal 

 joint of front tarsi with a small black comb at inner apex. Length, 2-5-3 mm. 



//r/6.— Queensland : Dalby (Mrs. F. H. Hobler).— Type, /. 12124 in South 

 Australian ^luseum ; cotype, C/2308 in Queensland ^Museum. 



The sculpture of the head, which, with the prothorax and elytra, are 

 entirely pale, readily distinguishes this species from all previously named ones. 

 At least four of the basal joints of antennae are flavous, the fifth and sixth are 

 also sometimes scarcely darker ; the coxai and bases of femora are black, the tibiae 

 are usually slightly infuscated in the middle. The head is opaque, owing to 

 dense punctures ; these are individually so small as to be scarcely traceable, and 

 in addition are partly concealed by clothing; from some directions the interocular 

 space appears to have three small foveie connected by a curved line ; from directly 

 in front the median one is seen to be much larger than the others; from behind 

 the two small tubercles on the interocular elevation are quite distinct. 



