44 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



Thorax : 619-752 (average 699) y, long. 



Prothorax. Pronotal ridge strong, but medially interrupted by weak sclerotization. Lateral 

 pronotal sclerites large, without setae. Medial pronotal setae absent. Post-tergites medium- 

 sized, without wavy striations, and without setae. Pleural structures typical of the family. 

 Sternum with strong transverse ridge, interrupted median ridge and narrow triangular sclerite. 

 Anteprosternal and prostemal setae absent. 



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

 wide as long (average 197 and 113 y. respectively) ; anterior margin curved ; laterally bounded 

 by the prescutal ridges and posteriorly by the prescutal suture ; medially with more heavy 

 sclerotization which is ridge-like posteriorly ; not reticulated. Scutum. Median membranous 

 area transverse, subrectangular ; 70-95 (average 86) y. long and 1-72-2-27 (average 2) times as 

 wide (width 156-190, average 171 y.) ; without setae. Scatellum 72-91 (average 80) y. long 

 and 148-190 (average 164) y. wide, the ratio being 1 : 20-23 (average 2-1) ; not tubular ; 

 usually with 2 h.s. Postnotum with anterior margin irregular and partly overlapped by meta- 

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

 distally. Mesopostphragma with moderately 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, becoming appreciably 

 broader ventrally, but below membranous cleft indistinct and only marked by a band of dark 

 sclerotization. Epimeron small. Lateropleurite partly bounded anteriorly by an extension 

 from marginal ridge. Basisternum large, about 272 y. wide and 230 y. long, i.e. 2-46-3-03 

 (average 2-70) times longer than membranous area of scutum ; with strong median ridge and 

 bounded by strong marginal and precoxal ridges ; with 0-2 (average 1 -4) h.s. on the median 

 ridge. Furca well developed. Mesothoracic spiracle with well developed peritreme ; post- 

 mesospiracular setae absent. Tegula small, membranous bulge with a small weak sclerite 

 posteriorly and with 1-5 (average 2-5) h.s. Third axillary wing sclerite with a pronounced 

 ventral projection at its base. Additional sclerite well defined. Antemetaspiracular setae 

 absent. 



Metathorax. Metanotum with thickening of posterior margin, sometimes desclerotized 

 medially ; suspensorial sclerites small, spot-like ; a small additional sclerite usually present 

 anterior to postnotum. Postnotum consisting of a transverse sclerite on each side. Metatergal 

 setae : occasionally one h.s. on each side. Pleural ridge well developed, though interrupted 

 near middle ; with a small wing process. Episternum with anterior margin ridge-like in parts ; 

 epimeron produced posteriorly. Metathoracic spiracle similar to mesothoracic one. Dorso- 

 spiracular setae absent. Postmetaspiracular setae : 0-2 (average 0-7) h.s. Metasternal plate 

 weak and irregular. Anterior and posterior metasternal setae usually consisting of 2 (range 1-3) 

 medial h.s. each ; occasionally a h.s. occurs lateral to the posterior part of the basisternum. 



Wings hyaline; long (1760-1910, average 1856 |j.) and of medium width (700-780, average 

 753 y.), the ratio width to length being 1 : 2-42-2-51 (average 2-46) ; alar lobe present ; alar 

 setae usually one (range 0-2) h.s. on each wing. Halteres well developed, 125-156 (average 

 142) y. long and 38-46 (average 43) y. wide, each with 1-3 (average 1 -8) apically hooked setae 

 which are about 73 y. long. 



Legs short and moderately slender, with middle pair shortest and hind pair longest ; ratio 

 length of hind leg to body length is 1 : 2-20-2-22 (average 2-21). Length of segments (in y.) : 



Leg 



Coxa 



Trochanter 



Femur 



Tibia 



Tarsus 



Claw 



Total 



I 



76-80 



93-118 



220-266 



344-391 



95-io3 



24-29 



857-984 





(79) 



(107) 



(245) 



(367) 



(98) 



(26) 



(922) 



11 



76-87 



95-110 



i94- 2 5i 



308-365 



101-114 



25-28 



798-955 





(83) 



(103) 



(222) 



(345) 



(108) 



(26) 



(886) 



III 



91-110 



106-125 



210-247 



331-395 



114-125 



26-30 



878-1034 





(100) 



("4) 



(235) 



(37i) 



(118) 



(27) 



(964) 



