72 



MORPHOLOGY AND TAXONOMY OF ADULT MALES 



these segments (in y.) 137-164 (average 149), 141-175 (average 155), 156-175 (average 165), 

 118-148 (average 135), 95-122 (average 113) and 76-91 (average 85) respectively, all of about 

 the same width, varying from 29 to 38 u, ; with 35-48 (average 42), 40-51 (average 47), 46-53 

 (average 48), 36-48 (average 42), 30-41 (average 33) and 20-28 (average 25) f.s., and 5-10 

 (average 8), 5-8 (average 6-7) 5-12 (average 77), 4-6 (average 4-6), 3-5 (average 4) and 0-4 

 (average 2-3) h.s. respectively ; antennal bristles on segments VIII-IX not distinctly different 

 from the f.s. Segment X : terminal part not constricted ; 84-91 (average 86) u. long and 

 57-68 (average 63) u. wide ; carrying 5-10 (average 7-3) f.s., 0-2 (average 1-5) h.s., 4-6 (average 

 5) capitate subapical setae and 5 antennal bristles of which the 3 long ones are less than half as 

 long as the segment and the 2 short ones about as long as the f.s. though thinner ; with 2 

 sensilla basiconica ventrally, one near apex and the other more proximal. 



Thorax 593-665 (average 637) \x long. 



Prothorax. Pronotal ridges strong, but medially interrupted by weak sclerotization. 

 Lateral pronotal sclerites small, without setae. Medial pronotal setae absent. Post-tergites 

 small, without striations and without setae. Pleural structures typical of family. Sternum 

 with strong transverse ridge, a median ridge which is occasionally interrupted in the middle, 

 and a well sclerotized triangular sclerite. Anteprosternal setae absent ; prostemal setae : 

 occasionally one h.s. on each side. 



Mesothorax. Mesoprephragma with shallow emargination. Prescutum more than twice as 

 wide as long (average 228 and 90 a. respectively) ; anterior margin curved ; laterally bounded 

 by the prescutal ridges and posteriorly by the prescutal suture ; with polygonal reticulation ; 

 slightly more heavily sclerotized medially. Scutum. Median membranous area subrectangular ; 

 96-114 (average 100) u. long and 2-00-2-82 (average 2-38) times as wide (width 205-236, average 

 221 u.) ; with 9-13 (average 12) h.s., usually with one on each side situated posterolateral!}' 

 immediately outside the membranous area. Scutellum large, 1 10-125 (average 118) u. long and 

 201-235 (average 220) u. wide, the ratio being 1 : 1-8-2-1 (average 1-9) ; not tubular ; with 

 0-2 (average 1 -6) h.s. Postnotum with anterior margin irregular and partly overlapped by 

 metathoracic fold ; postnotal apophysis and postalare well developed, the latter densely 

 reticulated distally. Mesopostphragma with deep emargination. Mesopleuron. Mesopleural 

 ridge strong, but interrupted above coxal articulation ; pleural apophysis and pleural wing 

 process well developed, the latter connected with episternum by a narrow basalare. Subalare 

 small. Episternum not reticulated ; subepisternal ridge well developed but below membranous 

 cleft indistinct and only marked by a band of dark sclerotization. Epimeron small. Latero- 

 pleurite partly bounded anteriorly by an extension from marginal ridge. Basisternum large, 

 about 262 (x wide and 183 u. long, i.e. 1-57-2-49 (average 1-92) times longer than membranous 

 area of scutum ; with strong median ridge and bounded by strong marginal and precoxal 

 ridges ; without setae. Furca well developed. Mesothoracic spiracle with well developed 

 peritreme ; postmesospiracular setae absent. Tegula small, membranous bulge with a weak 

 sclerite posteriorly and 7-1 1 (average 8-8) h.s. Third axillary wing sclerite with a large ventral 

 projection at its base. Additional sclerite elongated, well defined. Antemetaspiracular setae 

 absent. 



Fig. 21. Genus A, lateral view. 



