438 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



the concavity may be a wide or narrow, complete or incomplete, 

 central or median groove demarked by lateral carinae. In the median 

 groove there may be a single central carina that divides it equally 

 into right and left halves. The carina usually extends ventrally only 

 one-third to one-half the length of the groove. In other species the 

 median groove may be absent and the whole surface uniformly 

 punctate or irregularly ridged. Lateral areas are triangular and 

 located laterad to the lateral carinae outlining the median groove. 

 They are usually sculptured differently from the groove. Where the 

 median groove is present dorsaUy only, the lateral areas blend into 

 the concavity of the propodeum ventrally. 



Tegula (fig. 1): A small scalelike sclerite carried on the thorax at 

 the extreme base of the forewing. 



Ocellocular line: Line between the lateral margin of a lateral ocellus 

 to the medial margin of a compound eye as seen m dorsal view of the 

 head. 



Scape (fig. 2): The proximal division of the antenna that arises 

 from the base of the scrobe cavity, and articulates distally with the 

 pedicle. 



Flagellum: That part of the antenna distal to the ring joint. The 

 terminal unit may consist of what appears to be two and sometimes 

 three closely fused segments. Most often the last two are closely 

 fused, and the preceding thu*d segment is separated by a distinct 

 annulation. Thus the flagellum appears seven segmented or occa- 

 sionally six segmented if all three termmal units are fused. In a few 

 species the terminal unit may be weakly enlarged to give the appear- 

 ance of a subclavate condition. The remaining segments of the 

 flagellum are truncate distally. 



Marginal vein (fig. 5): Measurement of the length was made 

 from the point at which the proximal extension of the vein is flush 

 with the margin of the wmg, distaUy to the pomt at which the post- 

 marginal and stigmal veins diverge. 



Postmarginal vein: Measured from its pomt of departure from the 

 marginal vein to its distal tip. 



Stigmal vein and club: Short vein that extends from the distal end 

 of the marginal vein outward at less than a 45° angle. It ends in a 

 small enlargement known as the stigmal club. 



Forecoxa: The anterior face of the forecoxa in most species has a 

 shallow, oblique depression. In a few species the depression is 

 accentuated by a raised carina that makes it appear much deeper. 



Umbilicate puncture: Round depression circumscribed by a raised 

 carina with a smaU raised tubercle in the center. It covers the dorsum 

 of the thorax, head, and anterior of the head. 



