OF THE FAMILY COGCIDAE 69 



Prothurax . Pronotal ridge strong, but narrowly constricted medially. Lateral pronotal 

 sclerites small, without setae. Medial pronotal setae absent. Post-tergites elongated, with wavy 

 striations and without setae. Pleural structures typical of the family. Sternum with trans- 

 verse ridge strong, median ridge reduced to a short basal stalk and triangular sclerite well 

 sclerotized. Anteprosternal setae absent ; prosternal setae : 0-4 (average 1 -8) h.s. 



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

 wide as long (average 287 and 185 u. respectively) ; anterior margin curved ; laterally bounded 

 l>v the prescntal ridges and posteriorly by the presculal suture ; with weak, irregular reticula- 

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

 trapezoidal ; 108-186 (average 156) \i long and 1 -57- 2 40 (average 1 95) times as wide (width 

 247—334, average 298 y.) ; without setae. Scutellum large, 76—114 (average 96) \l long and 

 209-293 (average 250) \l wide, ratio being 1 : 1 4-1 -8 (average 1 -6) ; not tubular ; without 

 setae. Postnotum with anterior margin irregular and partly overlapped by metathoracic fold ; 

 postnatal apophysis and postalare well developed, the latter densely reticulated distally. Meso 

 postphragma with deep emargination. Mesopleuron. Mesopleural ridge strong, but interrupted 

 above coxal articulation ; pleural apophysis and pleural wing process well developed, the 

 I. iti> 1 connected with episternum by a narrow basalare. Subalare small, lipisternum not 

 reticulated ; subepisternal ridge well developed, but below membranous cleft indistinct and 

 only marked by a band of dark sclerotization. Epimeron small. Later opleurite partly 

 bounded anteriorly by an extension from marginal ridge. Basisternum large, about 430 u. 

 wide and 356 pi long, i.e. 2-08-2-81 (average 2-31) times Longer than membranous area of scutum ; 

 with strong median ridge and bounded by strong marginal and precoxal ridges ; without setae. 

 /•urea well developed. Mcsotlioracic spiracle with well developed peritrcme; postmesospinu ultii 

 setae absent. Tegula small, membranous bulge with a weak sclerite posteriorly and 2-7 

 (average 4-7) h.s. Third axillary wing sclerite with ,1 pronounced ventral projo tion at its I 

 Idditional sclerite elongated, well defined. Antemetaspiracular setae absent. 



Metathorax. Metanotum with anterior margin usually strong medially ; suspcnsurial 

 sclerites small, spot-like ; a small, additional sclerite present anterior to postnotum. Post- 

 notum consisting of a narrow, transverse sclerite on each side. Metatergal setae absent 

 Pleural ridge well developed, though interrupted in middle ; with small wing process, /'.pi- 

 sternum with anterior margin not ridge-like ; precoxal ridge absent ; epimeron produced 

 posteriorly. Metathoracic spiracle similar to mesothoracic one. Dorsospiracular setae absenl 

 Postmetaspiracular setae : 0-3 (average 1) f.s. and 4-8 (average 5-6) h.s. ; of the latter 3-7 are 

 situated dorsally and one or two more ventrally. Metasternum represented by a weak trans 

 verse plate. Anterior and posterior metasternal setae absent. 



Wings hyaline ; long (length 2350-2530, average 2490 u.) and of medium width (890-950, 

 average 911 [x), ratio width to length being 1 : 2-64-2-77 (average 2-68) ; alar lobe present ; 

 alar setae absent. Halteres well developed, 163-228 (average 202) y. long and 42-61 (average 

 52) (jl wide, each with 1-4 (average 23) apically hooked setae which are about 97 fi long. 



Legs long and slender, with middle pair shortest and hind pair longest ; ratio length of hind 

 leg to body is 1 : 1-54-1-73 (average 165). Length of segments (in jjl) : 



Leg 

 I 



II 



III 



Coxae with 14-22 f.s. on fore and middle coxa and 17-32 (average 25) on the hind coxa, and 

 with 12-23 (average 18) h.s. on fore coxa and 8-15 on the middle and hind coxa ; fore coxa 

 without coxal bristles ; apical setae about half as long as the trochanter. Trochanters 42-68 u, 

 wide, with 6-8 oval sensilla, 7-12 f.s. and 7-9 h.s., the latter including 2 minute setae near basal 



Coxa 



Trochanter 



Femur 



Tibia 



Tarsus 



Claw 



Total 



106-137 



114-186 



334-4 2 6 



562-760 



194-266 



38-48 



1379-1804 



("9) 



(171) 



(389) 



" (678) 



(242) 



(45) 



(1643) 



106-141 



114-186 



308-388 



543-749 



179-251 



40-49 



1321-1763 



(124) 



(164) 



(353) 



(669) 



(227) 



(46) 



(1584) 



1 14-156 



160-198 



334-4 J 9 



608-798 



188-304 



40-49 



1 444-1 908 



(136) 



(176) 



(384) 



(734) 



(249) 



(47) 



(1726) 



