New Species of Siaphylinidae from Singapore. 237 



Labial palpi 2-jointcd, elongate, styliform, reaching to the extremity 

 of the mandible, the joints of equal length and indistinctly separate. 

 Temples bordered below. Gular sutures distant, slightly divergent 

 behind. Prosternal process acuminate jiosteriorly. Mesosternum 

 broadly rounded behind, carinate, extending for about one-half the 

 length of the intermediate coxae, which are distant. Metasternal 

 process truncate, not quite meeting the mesosternal process. Tarsal 

 formula 4, 4, 5 ; the anterior tarsi with the first three joints short 

 and subequal, the 4th longer than the three preceding together; 

 the middle pair similarly constructed; the posterior pair with the 

 first four joints, a little longer than broad, subequal, the 5th as long 

 as the three preceding together. Elytra sinuate internal to the 

 postero- external angles. 



The genus has a facies much resembhng Neosilusa, but 

 differs structurally in the divided tongue and the keeled 

 mesosternum. 



93. Prosilusa rufa, n. sp. 



Rufo-castaneous, shining ; the elytra in great jjart, and the base 

 of the sixth abdominal segment pitchy-black. Antennae, mouth- 

 parts and legs reddish-testaceous. Length 2-5 mm. 



Head rather large, transverse, triangularly produced in front, 

 the eyes large and rather prominent, their diameter greater than 

 the length of the temples which are rounded and slightly con- 

 vergent posteriorly passing insensibly into the base; finely and 

 rather sparingly punctured, finely and sparingly pubescent. An- 

 tennae \vith the 2nd and 3rd joints subequal, not quite so long 

 as the 1st, the 4th to the 10th transverse, gradually increasing hi 

 breadth, the 10th fully two and a half times broader than long, 

 the 11th rather large, oval, bluntly pointed, longer than the two 

 preceding together. Thorax strongly transverse, rather more than 

 half as broad again as long, widest before the middle, the sides 

 bordered, contracted and rounded anteriorly, more strongly con- 

 tracted in a nearly straight line to the obtusely rounded posterior 

 angles, the base bordered and distinctly bisinuate; disc before the 

 scutellum with a deep transverse impression; finely and more 

 closely punctured than the head, finely pubescent. Scutellum 

 finely and indistinctly punctured. El3rtra broader and one-tliird 

 longer than the thorax, transverse, t)ie sides gently rounded, pitchy- 

 black, reddish towards the base, rather more finely and rather less 

 I'losely punctured than the thorax and finely pubescent. Abdomen 

 finely and rather sparingly punctured, much more so posteriorly, 

 finely and sparingly pubescent, the sides with fine setae. 



