ANATOMY OF MARELLIA REMIPES — CARBONELL 



73 



thorax (fig. 9), which in Mar dim is completely flat. The pterothoracic 

 plastron is in this species unusually wide and roughly rhombic in out- 

 line. As has already been remarked, the sternal region is by far 



2Ax Tq 



IPh Psc SpT 



[MsT 



ymi 



8A 



1 \ \ . 

 3Ax 4Ax 2Ax lAx 



Fig. 7. — The pterothoracic terga and the bases of the wings of Merellia remipes. 



lA, 2A, 3A, 8A, first, second, third, and eighth anal (vannal) veins; ANP, 

 anterior notal wing process ; lAx, 2 Ax, sAx, 4Ax, first, second, third, and fourth 

 axillary sclerites ; C, costa; Cu, cubitus; lAbT, first abdominal tergum; M, 

 media ; m, m', median plates of wing base ; MsT, mesothoracic tergum ; MtT, 

 metathoracic tergum ; P, tergal arm connected to anal veins of wing ; iPh, 

 first phragma ; Psc, lateral prescutal area ; R, radius ; R-\-M, united shafts of 

 radius and media in hind wing ; Sa, secondary anal vein ; Sc, subcosta ; Scl, 

 scutellum ; Set, principal part of scutum ; Set', Set', posterior, lateral subdivi- 

 sions of scutum; SpT, spinose tubercle of lateral prescutal area of mesotergum; 

 Tg, tegula ; Vd, vena dividens. 



the broadest part of the pterothorax, being widest at the anterior 

 margin of the coxal cavities of the hind legs. 



The mesosternum shows a curved anterior margin that overlaps 

 the posterior part of the prothoracic sternum. The pleurosternal su- 



