146 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



Antennal bristles distinct ; segments VIII and IX each with one ventral bristle. Terminal 

 segment with 3 preapical bristles, 2 capitate subapical sensory setae and 1 apical hair-like seta. 



Thorax : 517-570 (540)^ long. Prothorax : Pronotal ridges medially interrupted as usual. 

 Lateral pronotal sclerites small, and post-tergites comparatively large. Proepisternum with a 

 ridge-like dorsal margin. Prosternum subtriangular, 49-58 (52)0 long and 89—98 (92) (x wide ; 

 prosternal ridge absent, and its position only indicated by a narrow sclerotization. Prothoracic 

 setae on each side : Medial pronotal setae 3-5 (3-9) ; lateral pronotal setae 3-5 (3-4) ; post- 

 tergital setae 2-4 (3-0) ; antespiracular dorsal setae usually 5-7, and occasionally 9 (average 6-i). 

 Antespiracular ventral setae usually 2, and occasionally 3 (av. 2-1) ; prosternal setae 2-4 (2-9). 

 Prothoracic disc pores on each side : Medial pronotal pores 0-1 (0-3) ; lateral pronotal pores 

 2-4 (2-6) ; post-tergital pores absent ; antespiracular dorsal pores 2-3 (2-1). One prosternal 

 pore may occur on either side (av. 0-4). 



Mesothorax : Prescutum 85-95 (92) u. long (it is difficult to determine the actual length of the 

 scutum due to the absence of the prescutal suture), and 125-140 (134)0 wide, the ratio length 

 to width being 1 : 1-4-1-6 (1-5) ; prescutal ridge well developed and prescutal suture absent. 

 Scutum heavily sclerotized anterolaterally, with a median membranous longitudinal narrow 

 area ; 92-116 (no)a long, i.e. the ratio lengths of prescutum to scutum 1 : 1-1-1-3 (1-2). 

 Prealare, prealar ridge, triangular plate, anterior and posterior notal wing processes well developed. 

 Scutellum 46-52 (49) (i long and 92-104 (95)0. wide, i.e. the ratio its length to its width 1 : 1-9- 

 2-1 (1-94), and the ratio its length to the length of scutum 1 : 2-0-2-4 (2-3). Postalare with 

 well separated anterior and posterior ridges. Postnotal apophysis comparatively small. Meso- 

 pleuron : Mesopleural ridge interrupted above the coxal articulation ; basalare stout. Sub- 

 episternal ridge slender. Mesepisternum and mesepimeron distinct ; lateropleurite moderately 

 large. Mesosternum : Basisternum 134-159 (153) u. long and 137-159 (146)0 wide ; the 

 antero-median part of the marginal ridge absent ; precoxal ridge well developed. Furca 

 comparatively small. Mesothoracic spiracle 18-21 (20) o wide at opening, with a 34-40 (37) o 

 long supporting bar. Mesothoracic setae on each side : Prescutal setae 3-5 (3-6) ; scutal setae 

 5-7 (5-3) ; scutellar setae 1-3 (2-1). Tegular setae 2-4 (2-6). Postmesostigmatal setae 6-10 (7-7) 

 in a latero-ventral group. Basisternal setae 5-7 (6-i). Mesothoracic pores : 1-2 .(1-4) meso- 

 spiracular pores present behind each spiracle ; postmesostigmatal pores absent. 



Metathorax : Metapostnotal sclerites and metapostnotal ridge well developed. Metapleural 

 ridge with usual attenuation near the middle at the point of origin of the metapleural apophysis. 

 Precoxal ridge slender and metasternal apophyses small. Metathoracic spiracle identical with 

 the mesothoracic one. Metathoracic setae on one side : Metatergal setae 4-7 (5-1) ; metapleural 

 setae 1-3 (2-4). Anterior metasternal setae 3-6 (4-3) and posterior metasternal setae 2-3 (2-2). 

 Metathoracic pores on each side : Metaspiracular pores 1-3 (1-9) ; anterior metasternal pores 

 usually 1-2 and occasionally 3 or 4 (av. 1-9) ; posterior metasternal pores absent. 



Wings : 770-910 (854)0. long and 280-350 (322) o wide ; with 2-4 (3-1) alar setae and 2 

 minute circular sensoria. Hamulohalterae 64-70 (69)0 long and 12-15 ( I 4)l jl wide ; with one 

 apically hooked, 40-46 (43)0 long seta, i.e. the ratio lengths of seta to hamulohaltera 1 : 1-4- 

 1-7 (i-6). 



Legs : Short and slender ; the ratio length of hind leg to the total body length 1 : 2-3- 

 2*4 (2-38). Coxa and trochanter about 49 and 240 wide respectively. Femur about 40a wide ; 

 that of the hind leg longest and those of the front and middle legs of about the same length ; 

 the ratio width to length of the hind femur 1 : 3-8-4-2 (4-1). Tibia about 190 wide ; with 

 two apical strong spurs and 2-4 smaller spines ; the ratio lengths of femur to tibia in front 

 leg i-i-i (1-06) : 1. Tarsus about 180 wide ; tarsal digitules apically knobbed. Claw 

 uniformly tapering to a sharply pointed tip ; ungual digitules extremely fine. The lengths of 

 the leg segments (in microns) and the number of setae on each are given below : 



