48 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



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

 sclerite posteriorly and 2-7 (average 4-2) h.s. Third axillary wing sclerite with a pronounced 

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

 absent. 



Metathorax. Metanotum with posterior margin usually strong and well developed throughout ; 

 siispensorial sclerites small, spot-like. Postnotnm consisting of a transverse sclerite on each side. 

 Metatergal setae absent. Pleural ridge well developed, though interrupted near middle ; with 

 a small wing process. Episternum with anterior margin not ridge-like ; vestigial precoxal 

 ridge present ; epimeron produced posteriorly. Metathoracic spiracle similar to mesothoracic 

 one. Dorsospiracular setae absent. Postmetaspiracular setae : occasionally one h.s. present. 

 Metasternal plate weak and irregular. Anterior and posterior metasternal setae : 1-5 (average 

 2-4) and 0-3 (average 1 -8) h.s. respectively, arranged medially. 



Wings hyaline; medium-sized : 1300- 1450 (average 1367) y. long and 470-580 (averago 542) y 

 wide, ratio width to length being 1 : 2-44-2-77 (average 2-53) ; alar lobe present ; alar setae 

 absent. Halteres well developed, 103-137 (average 117) y long and 27-43 (average 35) y wide ; 

 each usually with 2 (range 1-3) apically hooked setae, which are about 62 y. long. 



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

 ratio length of hind leg to body length is 1 : 2-30-2-47 (average 2-41). Length of segments 

 (in y) : 



Leg 



I 



II 

 III 



F.s. slender and sometimes difficult to separate from h.s. 



Coxae with 1-6 (average 3-4) f.s. on the fore and 5-14 on the middle and hind coxa, and each 

 with 9-16 h.s. ; fore coxa without coxal bristles ; apical seta about f as long as trochanter. 

 Trochanters 27-38 y. wide ; with 6 oval sensilla, 1-8 f.s. and 5-6 h.s., the latter including 2 

 minute setae near basal ridge, one small seta on outer margin and 2 long setae, of which the 

 longest (apical), on the fore trochanter, is 2-1-2-6 (average 2-4) times as long as width of 

 trochanter. Femora of medium width (42-49 y), ratio width to length of hind femur being 



1 : 3-6-4-4 (average 3-8) ; with 1-11 (average 5-3), 3-14 (average 7-8) and 4-17 (average 9-8) f.s. 

 on the fore, middle and hind femur respectively and with 6-19 h.s. on each. Tibiae 23-30 u. 

 wide, ratio width to length of hind tibia being 1 : 8-3-10-0 (average 9-2) ; each with 24-49 

 setae of which 15-26 are h.s. and 7-28 f.s., the latter about as long as width of tibia ; apical 

 spur about the same size on all tibiae. Tarsi 23-30 y wide, hind tarsus 2-9-3-9 (average 3-3) 

 times longer than wide ; each with 1-6 f.s. and 6-10 h.s. ; tarsal digitules subequal, longer 

 than claw. Claws of medium length, about as long as width of tarsus ; slightly curved, with 

 small denticle near tip ; ungual digitules subequal, about as long as claw. 



Abdomen 380-760 (average 499) y. long and 320-440 (average 376) y. wide. 



Segments I-VII : tergites and sternites present on all segments ; tergites on segments II-III 

 represented by a small sclerite on each side on the anterior margin, and on segments IV— VII 

 represented by a small sclerite on each side on the anterior margin, and on the IV-VII segments 

 by weak plates ; sternites consisting of weak transverse plates. Caudal extension of segment 

 VII small, rounded, not sclerotized. Dorsal setae : f.s. absent ; h.s. usually absent on segments 

 I— VI, but segment VII with one on each side. Pleural setae consisting of h.s. only, which 

 include dorsopleural setae : occasionally one on II, 0-2 (average 1 -i) on III and usually 2 on each 

 of segments IV-VI, and ventropleural setae : sometimes one on II and III, and one on each of 

 segments IV-VI. Segment VII with 3-4 (average 3-9) h.s. Ventral setae : h.s. only, usually 



2 medially on all segments, but occasionally only one or up to 4 present. 



Coxa 



Trochanter 



Femur 



Tibia 



Tarsus 



Claw 



Total 



57-7° 



78-110 



165-217 



209-300 



63-80 



23-27 



600-805 



(66) 



(94) 



(187) 



(248) 



(7i) 



(25) 



(691) 



65-91 



78-110 



154-205 



209-289 



74-95 



26-28 



608-815 



(73) 



(88) 



(171) 



(242) 



(82) 



(27) 



(684) 



7 2 -95 



82-110 



163-220 



220-314 



76-110 



27-30 



667-866 



(80) 



(94) 



(i«7) 



(262) 



(9o) 



(28) 



(74i) 



