170 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



36. Genus DEINELENCHUS Perkins (190S). 



Name derived from decvbg (powerful) + Elenchus, meaning very 

 large Elenchid. 



Type-species. — Beinelenchus australensis Perkins. 

 Parasitic on Platybrachys , limited to Australia. 

 The original description was as follows : 



Male. — Like Elenchus in most respects, e. g., in the structure of the tarsi and anten- 

 nae, but very much larger, and with the second antennal joint, seen from above, 

 very short and transverse, the basal one elongate. Frontal process much blunter and 

 lees prominent than in Elenchus. As in that genus, the face is deeply excavated, 

 but it is much more open, not triangular, but with the sharp edge of the front and 

 sides forming a great semicircle, or rather more. The palpi are two-jointed sparsely 

 pilose, the second joint narrower than the first and in the form of a curved blade. 

 The postscutellum of the metathorax is longer than in Elenchus. 



Female. — Head nearly circular, very wide, the anterior margin simply and widely 

 rounded, with no defined anterior median area, and without evident tubercles in 

 front. Between the openings of the brood-chamber and the anterior margin there 

 are two distinct areas marked out by impressed lines, which run backward to the 

 brood-chamber orifice as deep grooves on either side of a smooth slightly raised tuber- 

 cle. Opening of the brood-chamber bisecting the head in surface view. Allied to 

 Elenchus by the absence of a definite anterior median area and the presence of those 

 on the disk, between the anterior margin of the head and the orifice of the brood- 

 chamber (Perkins, 1905). 



i. DEINELENCHUS AUSTRALENSIS Perkins (1905). 



Host. — Platybrachys, species, Cairns; Queensland. 

 Perkins described this species as follows: 



Male. — Piceous, perhaps blacker in mature specimens; the sides and the scutellum 

 of the metathorax pale, its anterior lobe and postscutellum dark. Legs with the 

 femora pale, the tibiae dark, fuscous. Elytra for the most part blackish, the wings 

 quite smoky, with a slight iridescence, neuration black. Expanse probably about 

 4.5-5 mm. 



Female. — Head brownish in front of and yellow behind the brood-chamber orifice. 

 The discal areas between the latter and the apical margin somewhat fan-shaped, 

 and themselves divided by very fine grooves. Sometimes in apical view of the 

 head two round faint spots can be seen, but there is no definite median area nor 

 tubercles. Length and breadth each about | mm. 



Male puparium dark brown with a pale ring at the base of its protruded portion 

 (Perkins, 1905). 



37. Genus COLACINA Westwood (1877). 



Type of genus. — Colacina insidiator Westwood (1877). 



Name derived from nbXac- (parasite). 



The genus is parasitic on Fulgoridse of the genus Epora, and at 

 present is restricted to the Malayan regions. 



On Colacina Saunders (1872) based his group Homopterobise. 

 The location of the genus is uncertain, although it is probably allied 

 to the other fulgorid parasites, which are all elenchids. 



