44 R- W. CROSSKEY 



group name. I much favour this course, but for the present continue with the 

 usage of Proseninae - with 'Dexiinae' suffixed parenthetically - in order to be 

 consistent with recent literature. 



The subfamily as here interpreted has been defined in a preliminary way, on 

 adult characters, in an earlier paper (Crosskey, 1973ft : 41) and this definition will 

 not be repeated. The Oriental forms fully conform to it. 



The tribes Prosenini (Dexiini), Rutiliini and Doleschallini are present in the 

 Oriental fauna and can be differentiated by the following key. 



Key to Oriental Tribes of PROSENINAE (DEXIINAE) 



Postalar callus with four or more strong setae. Suprasquamal ridge (Text-fig. 145) 

 or the postalar wall with a bushy tuft of hair. Scutellum with at least four pairs 

 of marginal setae (sometimes with many supernumerary marginals as Text-fig. 80). 

 Facial carina present (very large). Propleuron haired. [Very robust forms, 

 nearly always possessing some metallic coppery, green or blue colour] . RUTILIINI (p. 50) 



Postalar callus with two strong setae. Suprasquamal ridge and postalar wall bare. 

 Scutellum with two or three pairs of marginal setae (usually three arranged as 

 Text-fig. 75). Facial carina present or absent. Propleuron bare or haired. [Form 

 varied, usually rather or very slender, always without such metallic colouring] . 2 



Head profile subtriangular, profrons very prominent and the lower part of the head 

 receding, head much longer at the antennal axis than at the epistomal axis (Text- 

 fig. 29). Abdominal Ti -f 2 excavate only at its base. Posteroventral declivity 

 of the thorax deep and sclerotized across its width, the hind coxae and abdominal 

 base widely separated. Scutellum with two pairs of strong marginal setae, if 

 occasionally third pair (apicals) present then these very weak in relation to the 

 other marginals. Facial carina absent. [Exceedingly slender forms with very 

 attenuate parallel-sided or slightly fusiform abdomen] DOLESCHALLINI (p. 50) 



Head not conspicuously subtriangular, as long or nearly as long at the epistomal ax is 

 as at the antennal axis (Text-figs 28 and 30). Abdominal Ti + 2 excavate to it s 

 hind margin (except in Dexiotrix). Posteroventral declivity of the thorax mem- 

 branous medially, the hind coxae and abdominal base not widely separated. 

 Scutellum with three pairs of strong marginal setae (typically disposed as in Text- 

 fig. 75). Facial carina present or absent. [Varied forms, but usually without such 

 extreme attenuation of the abdomen] ..... PROSENINI (p. 44) 



Tribe PROSENINI 



(Dexiini) 



The great majority of Oriental Proseninae (Dexiinae) are members of this tribe, 

 the other prosenine tribes represented in the region (viz. Doleschallini and Rutiliini) 

 accounting for only about one-fifth of the species of Proseninae known throughout 

 the Oriental Region. In the present work ten genera of Prosenini are recognized 

 in the Oriental area, but some of these (Phorostoma, Dolichodexia, Dexiotrix) are 

 essentially Palaearctic genera that penetrate only into the northern, Himalayan, 

 fringe of the Oriental Region. A large number of so-called genera have been 

 proposed that belong in this tribe, either in the Dexia or the Billaea complexes, 



