4 o 



MORPHOLOGY AND TAXONOMY OF ADULT MALES 



95) (x long and 2-06-3-00 (average 2-36) times as wide (width 203-251, average 223 y.) ; without 

 setae. Scutellum 93-114 (average 107) u. long and 217-266 (average 236) [x wide, the ratio 

 being 1 : 2-0-2-5 (average 2-2) ; not tubular and without setae. Postnotum with anterior 

 margin usually irregular and partly overlapped by metathoracic 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 mem- 

 branous 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 383 u. wide and 287 u. long, i.e. 2-70-3-62 (average 3 04) times longer than mem- 

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

 precoxal ridges. Furca well developed. Mesothoracic spiracle with well developed peritreme ; 

 postmesospiracular setae absent. Tegula comparatively large ; membranous bulge with a 

 small weak sclerite posteriorly, with 6-10 (average 7-7) h.s. and sometimes showing wavy 

 striations. 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, irregular ; a small additional sclerite always present 

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

 setae absent. Pleural ridge well developed, though interrupted near the middle ; with a small 

 wing process. Episternum with anterior margin ridge-like in parts ; epimeron produced 

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

 Postmetaspiracular setae : 0-2 (average 09) h.s. Metasternal plate weak and irregular. 

 Anterior metasternal setae consisting of 0-2 (average 1-4) medial h.s. and occasionally with one 

 or two lateral to the posterior part of the basisternum ; posterior metasternal setae usually 2 

 (range 1-3) h.s. medially. 



Wings hyaline ; of medium length (1750-2000, average 1879 y.) but comparatively broad 

 (width 780-870, average 840 u.), ratio width to length being 1 : 2-13-2-35 (average 2-24) ; 

 alar lobe present ; alar setae : 1-3 (average 1-7) h.s. on each wing. Halteres well developed, 

 163-201 (average 178) u. long and 42-61 (average 53) [i wide, each with 2-4 (average 26) 

 apically hooked setae which are about 70 [i long. 



Legs short and slender, with fore pair shortest and hind pair longest ; ratio length of hind leg 

 to body length is 1 : 2-07-2-15 (average 2-10). Length of segments (in jx) : 



Leg 



Coxa 



Trochanter 



Femur 



Tibia 



Tarsus 



Claw 



Total 



I 



91-103 



118-148 



274-346 



353-437 



93" io 3 



29-34 



973-1094 





(95) 



(128) 



(301) 



(39i) 



(98) 



(30) 



(1043) 



II 



99-118 



120-133 



251-308 



433-479 



H4- I 33 



29-34 



1058-1203 





(no) 



(129) 



(285) 



(45o) 



(124) 



(32) 



(1130) 



III 



106— 141 



125-143 



281-315 



456-532 



125-148 



3o-34 



1132-1303 





(124) 



(134) 



(295) 



(499) 



(134) 



(32) 



(1217) 



Fig. 3. Eulecanium tiliae (L.), lateral view. 



