154 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



joint, very short; third joint with stem as short as preceding joints 

 but elongated anterior^ into a very long, ribbon-like lamella which 

 twists around the fourth joint; fourth joint surpassing third by 

 length of stem of first three; third and fourth joints very slightly 

 inflated, thickly covered with very fine hairs and very closely pro- 

 vided with large sensory pores. Eyes globular; lenses few, large, 

 and separated by slightly raised, densely pubescent partitions. The 

 mandibles are transparent yellow lancet-shaped appendages, curved 

 slightly at the base, toothed near the tip, obliquely truncate and 

 acute at tip. Almost obscuring the mandibles is a highly developed 

 three-jointed appendage, with the first two joints subequal, semi- 

 cylindrical, elbowed at each joint, and with the third an immense 

 paddle-shaped sensitive lamella, fully as broad as the e}^es, being 

 broadest before the middle and thence narrowing to a rounded tip 

 about one-third as wide, and measuring in length about the distance 

 from the inner edge of one eye to the outer edge of the other. The 

 pro thorax is a mere band. The mesothorax is about double the 

 length of the pro thorax. The metathorax is typical. The lumbi of 

 the scutum do not meet in the center and are somewhat elevated, 

 with the interior margin rounded; the praescutum and the scutellum 

 are distinctly separated, but together resemble a spindle; the post- 

 lumbium is shield-shaped, rounded behind, lower than the scutellum, 

 rather concave, medianly longitudinally ridged, closely, finely punc- 

 tate, yellowish; postscutellum long, narrow, surpassing the femoralia 

 which cover the sides of the body and several abdominal segments. 

 The thorax, with the exception of the postlumbium, is finely pubes- 

 cent. Elytra short, narrow, apicalty thickened and rumpled into 

 many ridges, thickly pubescent. Wings large, surpassing abdomen, 

 consisting merely of the primary veins, costa, subcosta, radius, and 

 media from the costal stalk and the first and second anal from the 

 anal stalk; radius arises from subcosta; the second anal is not ba- 

 sally attached. Coxse of first two pair of legs single-jointed, long; 

 third pair with rather short coxas, and a long trochanter. Femora 

 and tibiae longitudinally obliquely furrowed. Tarsi four-jointed, each 

 joint inserted far before the apex of the preceding and with the apex 

 sucker-like or pulvilliform. The abdomen is short and is mainly 

 characterized by the peculiar oedeagus, which is immediately dilated 

 at base, then turned and narrowed into a very acute curved process. 

 Female. — Length of cephalothorax 0.61 mm., breadth at spiracles 

 0.65 mm., breadth of head 0.57 mm., distance between mandibles 

 0.14 mm. Cephalothorax yellowish with dark brown band on base 

 and base of abdomen, forming a collar; broad, subquadrate, con- 

 stricted at base, broadest at spiracles, spiracles large convex, later- 

 ally prominent, placed obliquely; thence straight, slightly oblique, 

 obtusely angled about anterior eighth and thence more oblique to 



