368 DadylopiiiKE, 



TYLOCOCCUS FORMICARII, nov. 

 (Plate CXLVII.) 



Adult female subcircular ; strongly convex above ; transversely wrinkled 

 Thinly dusted with white meal ; body brownish where exposed. A thick tufted 

 fringe of white cottony secretion proceeding from beneath, and partly over- 

 lapping the margin, raises the insect from its support. No ovisac. After 

 treatment with potash, the margin is seen to be strongly produced into pro- 

 minent lobes, of which there are seventeen on each side, each with a dense 

 cluster of long, slender, sharply-pointed spines and spiniform setse (see 

 figs. 2, 5). Before compression there are deep incisions between the segments, 

 but these are partially obliterated after compression {fig. i). Antenna {fig. 2) 

 eight-jointed. In some examples the third and fourth or fourth and fifth joints 

 are more or less confluent, suggesting a reversion to a seven-jointed form. And 

 there Is occasionally a partial division of the eighth joint which, if complete, 

 would result in a nine-jointed form. In the normal eight-jointed antenna, the 

 eighth is more than twice as long as the second, which is the next longest ; 

 fourth and fifth shortest, equal. Eye well defined, but scarcely prominent 

 {fig. 2). Legs comparatively small, but robust [sttfigs. 1,3); tibia, tarsus and 

 claw together shorter than femur (plus trochanter) ; femur very broad ; tibia 

 scarcely longer than broad ; tarsus as long as the tibia ; claw (see fig. 4) large 

 and stout, more than half as long as the tarsus ; tarsal digitules simple, ungual 

 digitules slightly dilated at extremity. Anal ring with six comparatively short 

 stout setae Anal orifice surrounded and partly obscured by a loose cluster of 

 stout hairs. Derm with numerous short stout hairs and minute circular pores. 

 Some larger pores surrounding the genital orifice, on the venter. Caudal setae 

 approximately two and a half times as long as the anal setse. Anterior and 

 posterior glandular fovete conspicuous ; the posterior pair very large and with 

 stout tumescent lips (see fig. i). Length 1-85 to 2-0 mm. Breadth 175 to rSj 

 mm. 



Larva ovate. Margin without prominent lobes, but with a marginal series 

 of moderately stout curved setae. Antenna six-jointed. Limbs rather stout ; 

 tarsus longer than tibia. Claw stout and falcate. Length o'45 mm. 



Early nymph with a close covering of white meal. There are still no marginal 

 prominences, but there are clusters of stout setse on the marginal area of each 

 segment. Antenna six-jointed, the second joint elongated. Length o'65 mm. 



From nests of Cremastogaster, on Grewia columnana. Maha lUuppalama. 



