NO. 13 STAPH YLINIDAE — BLACK WELDER 33 



another along the axis of the disk, of three to six setae ; and the third 

 of one to three setae along the scutellar margin. Each seta is set 

 in a puncture at the center of a small smooth area, so that it is some- 

 what isolated from the surrounding smaller setae. The dense smaller 

 setae are of two colors, pale and black. They are arranged in fairly 

 definite groups, thus giving rise to the black and white markings of 

 the el}^ra. Rather frequently interspersed among the setae are several 

 types of pores or punctures which appear to be glandular. 



Certain parts of the surface are sculptured in various ways (fig. 



6 C, D, E). The point indicated at s in figure 6 F probably forms part 

 of the articulation of the elytra with the mesonotum and appears to 

 be very finely scaly (fig. 6 C). This area extends for a short distance 

 on both the dorsal and ventral surfaces of the elytron, and the scales 

 grade ofif anteriorly into minute points (fig. 6 D, E). 



The elytron articulates with the mesonotum by means of the two 

 wing processes (fig. 6 B, anp, pnp). The connecting membrane bears 

 two irregular, very lightly sclerotized areas, which have been inter- 

 preted as the first and second axillary sclerites {ax. i, ax. 2). The 

 axillary cord {axe) proceeds from the margin of the scutellum. As 

 the actual movement of the elytron is rather slight, the whole articu- 

 lating mechanism is much less developed than that of the hind wings. 



The hind wings (fig. 7 A) are well developed, being nearly as long 

 as the entire body. The wing is approximately one-third as wide as 

 long, with a distinct and heavily sclerotized hinge just proximad of 

 the stigma, and a large separate anal lobe. The venation is greatly re- 

 duced and not easily homologized. The following scheme is tenta- 

 tively adopted here. 



The most conspicuous vein is the one arising from the articulation 

 with the first axillary sclerite (fig. 6 A, ax. i) and extending to the 

 hinge, enclosing a narrow costal area. This vein is the subcosta united 

 with the radius (fig.7 A, Sc, R). It is apparently double, as shown, 

 the anterior and the basal parts representing the subcosta, the distal 

 part being chiefly radius. The costa is anterior to the subcosta but 

 is rather indefinite. It is represented by an oval area (fig. 7 A, C, and 



7 D) near the base of the wing and by the anterior basal edge of the 

 wing. The base of the subcosta articulates with the first axillary 

 sclerite (fig. 6 A) , but the costa is the only part of the wing that could 

 come in contact with the anterior notal wing process {anp). The sub- 

 basal area (fig. 7 D) appears to be a raised sclerotic plate bearing 

 numerous setae. It is surrounded by membranous areas and does not 

 touch the margin of the wing. This is the only part of the wing bear- 

 ing true setae. 



