290 PROCEEDINGS OF THE NATIONAL MUSEUM vol.87 



Antennae 0.35 mm. long, reaching middle of lateral prothoracic 

 margin ; segment 2 one-half longer than 1 ; 4 equal in length to 3 but 

 broader; 5-10 filiform, each one-half longer than 4 and distinctly 

 broader; 11 longer than 10, sides subparallel, rounded from apical 

 third to apex. Distal segment of maxillary palpi enlarged, showing 

 a sexually dimorphic form, viz: in male, two anteapical segments 

 thickened, distal one oblong-ovate, sides subparallel, angles all 

 rounded (fig. 16, h) \ in female, anteapical segments normal, thin, 

 distal one with the form of an elongate scalene triangle, apical 

 angle acute, mesal angle rounded, broadest at apical third (fig. 16, 

 d). Eyes large, coarsely faceted, entire, without emargination. 

 Pronotum slightly broader than long (0.32 by 0.26 mm.), apex and 

 sides rounded, basal angles obtuse, base arcuate, midbasal lobe short, 

 but rounded. Scutellum small, broadly triangular. Elytra about 

 two and two-thirds times as long as broad (0.8 by 0.32 mm.), 

 sides parallel to within one-fourth of apex, thence attenuate and 

 broadly rounded to apex, apices individually rounded. Interme- 

 diate tibiae and tarsi long, equal in length ; penultimate segment of 

 anterior and intermediate tarsi §imple. Posterior tibiae with two 

 oblique ridges extending halfway across outer surface ; basitarsi with 

 two, second segment with one oblique ridge, all extending halfway 

 across outer surface. Tarsal claws with three distinct teeth (fig. 

 18, d). A single spur visible on posterior tibiae, thick, three-fourths 

 as long as basitarsus. Anal style three times as long as apical ven- 

 tral segment (0.45 by 0.15 mm.), narrow, attenuate to apex; last 

 ventral segment two and one-half times as long as penultimate one. 



Typ^ locality. — Paraiso, Canal Zone, Panama. 



7'y;?e.— Male, U.S.N.M. No. 52914. 



Remarks. — Both the type and allotype were taken at Paraiso, 

 Canal Zone, Panama, January 25 and 30, 1911 (E. A. Schwarz). As 

 noted above there exists a distinct sexual dimorphism in the differ- 

 ence of the color of the ventral surface and in the shape of the distal 

 segment of the maxillary palpi. 



MORDELLISTENA SPARSA Champion 



MordelUstena sparsa Champion, Biologia Centrali-Americana, Coleoptera, vol. 4, 

 pt. 2, p. 335, pi. 15, figs. 4, 4a, 1891. 



Five specimens: District Federale, Mexico (L. Conradt). 



