New Species of Siaphjlinidae from Singapore. 353 



10. 



11. 



4th tarsal joint simple, not presenting a 



bilobed appearance. 7. 



. 4th joint of maxillary palpi very short, 



broad and obtuse ; anterior tarsi dilated Paederus F. 

 4th joint of maxillary palpi minute, 



subulate. 4. 



Labrum bi- dentate or slightly emarginate 



in the middle of the anterior border. 5. 



Labrum with 5 or 6 distinct teeth ; head 



with simple puncturation ; elytra 



strongly punctured, more or less in 



rows ...... Psilotrachelus Kr. 



Labrum bidentate. .... 6. 



Labrum emarginate .... Acanthoglossa Kr. 



Thorax elongate ; abdomen parallel ; 



anal styles distinct .... Astenus Steph. 

 Thorax shorter and broader; abdomen 



somewhat contracted at the base ; anal 



styles wanting ..... Stilicopsis Sachse. 

 Antennae with the first two joints stout, 



the following slender . . . Thinocharis Kr. 



Antennae of normal build. 8. 



Neck slender or very slender. 9. 



Neck broad ..... Medon, Steph. 



Labrum without teeth; 1st joint of the 



antennae sulcate from apex nearly to 



the base ..... Parascopaeus Cam. 



Labrum toothed; 1st joint of the 



antennae not sulcate. 10. 



1st joint of the posterior tarsi elongate, 



distinctly longer than the last ; tongue 



bifid Stilicus Latr. 



1st joint of the posterior tarsi short, not 



longer than the last ; tongue trifid . Scopaeus Er. 

 Tibiae spinose ; 4th joint of the maxillary 



palpi distinct, conical; tongue bi- 

 lobed Cryptobium Mannh. 



Tibiae setose ; 4th joint of the maxillary 



palpi veiy small, obtuse, scarcely 



visible ; tongue simple . . . Calliderma Motsch. 



Xantholinini, 

 1. Tibiae not spinose 

 — Tibiae spinose. 

 TRANS. ENT. SOC. LOND, 1920. 



. Somoleptus Shp. 

 2. 

 PARTS III, IV, V. (APR. '21) A A 



