450 PROCEEDINGS OF THE NATIONAL MUSEUM 



(suture), scutellum large, well developed, almost diamond shaped,' 

 with shield-shaped depression at apex, postscutellum with indicatiori 

 of median division; metanotum with anterior median depressed 

 area, scutum almost divided into two, sometimes irregularly shaped 

 lobes, shorter medially than mesoscutum, scutellum triangle shaped, 

 smaller than that of mesoscutum with almost straight posterior mar-i 

 gin, postscutellum almost hidden; pleura of both meso thorax anc 

 metathorax similar, the episternum divided into the anepisterntur 

 and katepisternum, separated by the pleural sutm'e from the elongat( 

 epimeron; katepisternum with a small anteroventral trochantin 

 sternum of mesothorax and metathorax divided into two halves bj 

 a median longitudinal sulcus, the supraepisternum more medial 

 the infraepisternum more lateral. 



Legs (fig. 8,f-h) : Metathoracic pair longer than prothoracic o: 

 meso thoracic pair; coxae free, forecoxae cylindrical, widely separated 

 mesothoracic and metathoracic coxae more widely spaced, broadeij 

 more truncate (mesothoracic coxae slightly longer), divided into i 

 larger anterior coxa vera and a much smaller posterior basal meron( 

 trochanters short, entire; femora elongate and cylindrical; tibia: 

 slightly narrower basally and distally, of a length almost equal tl 

 or shorter than that of the femora in the prothoracic and mesothoraci 

 legs, posterior tibiae almost 1^ times the length of the femora; on 

 spur on distal end of prothoracic tibiae and two on distal ends c 

 mesothoracic and metathoracic tibiae; tarsi 5-segmented, the mets 

 tarsus (first segment) the longest, the fourth the shortest {Sisyrc 

 Climacia), the fifth bearing a pair of strongly curved, simple clawi' 

 with a broad ventral padlike setose empodium between. 



Wings (figs. 10, 11): The wing venation terminology used in th: 

 revision is basically that of Martynov (1928, pp. 89-91) and Carpentc 

 (1940, pp. 253-256). These investigators, along with Tillyard i 

 his later views (1932, p. 29), and probably Lameere (1922, pp. 135 

 149), hold to the theory of the basal fusion or coalescence of M! 

 with Rs, thus making MA what Killington (1936, p. 29) and Cod 

 stock (1918, p. 178) consider R5 without the fusion. Killingtc 

 maintains that the base of M lies so close to R that there is difficull 

 in distinguishing these veins, and that R and M may be readi 

 separated by a fold in the membrane between them. Like Comstoc 

 he divided the media into Ml, M2, M3, and M4 (corresponding veil 

 considered branches of MP by Martynov and Carpenter). Carpent 

 (1940, pp. 194, 253) mentions that the free basal piece of MA — tl, 

 faint, obliquely transverse vein appearing at the base of M just befa ^ 

 it coalesces with R in the forewings of many Hemerobiidae ai 

 related families — is usually absent in the Sisyridae, in which fami k 

 Rs arises near the base of the wing and coalesces with MA for a shcpe 



i^i 



