212 TERTIARY INSECTS OF NORTH AMERICA. 



7. Labiduromma exsulatum. 

 PI. 16, Fig. 12 ( 9 ). 



Head transversely obovate, only a little broader than long, the front 

 considerably and triangulai-ly produced, the hinder edge almost straight in 

 the middle. AnteinisB barely reaching to the extremity of the tegmina, 

 composed of ten joints, the first rounded obpyriform, nearly as broad as 

 long, and not greatly stouter than the succeeding, the others c)dindi-ical, 

 the second scarcely longer than broad, the third and fourth half as long 

 again as broad, the fifth nearly find the sixth more than twice as long as 

 broad, the seventh three times as long as broad, the remainder as long as 

 the seventh, but increasing very slighth" in slenderness to the tip, which is 

 very bluntly rounded. All the joints are not shown in Fig. 12, which rep- 

 resents the specimen in which the antennee are best preserved. Terminal 

 joint of palpi about twice as long as broad, equally rounded at each extrem- 

 it}^, about half as broad as the antennje. Pronotum suborbicular, a little 

 broader than long and somewhat narrower than the head, the posterior 

 margin well rounded. Tegmina together nearly twice as broad as the pro- 

 notum, each twice as long as broad. Wings with the main rays continuous 

 in direction in the outer half of the wing, the branches appended interiorly 

 and not diverging strongly at base ; in the interior half widely forked, the 

 forks continuously divergent. Legs moderately short, subequal, rather 

 slender, the middle pair apparenth' inserted nearer the front than the hind 

 pair, the tibiai about half tlie width of the femora. Abdomen slender, with 

 parallel sides in the male, fullest beyond the middle in the female. Last 

 segment similar to the penultimate and scarcely smaller, its posterior margin 

 gently convex. Pygidium unapparent. Forceps about as long as the last 

 three segments, laminate, nearly straight, directed backward, the basal third 

 straight and equal, subattingent, the remainder tapering slightly and equally 

 with a slight falcation to a blunt, sometimes slightly incurved tip (t?) ; or 

 apparently somewhat stouter and coarser than in the other sex, sti-aight, 

 laminate, tapering throughout with no falcation ; only lateral views, how- 

 ever, have been obtained ($). 



Length of body, excluding forceps, S 16. .5"", ? 15°""; breadth of head, 

 S 2.2"""; of pronotum, S 1.9"™; of combined tegmina, <? 3.5"""; of middle 

 of abdomen, S 3.5™™, 2 4.25'"™; length of antennje, 6™™; of forceps, S 4™"", 

 $ 3.25™™ ; breadth at base, S 1 2™™ ; at tip, i 0.35™™. 



