278 PROCEEDINGS OF THE NATIONAL MUSEUM vol.87 



genus it is also allied, it may be separated by the presence of a sub- 

 apical ridge on the posterior tibiae, the much narrower shape of the 

 body, the flat tibial spur, and characters as mentioned in comparison 

 with MordelJa above. Mordelloides, Zeamordella^ and Reynoldsiella 

 may be linked together because of the semicircular scutellum. 



The single broad, flattened spur of the posterior tibiae is unique 

 among known Mordellidae and will readily separate this form from 

 any other member of the family. 



Form suboval, moderately robust, convex. Distal segment of maxil- 

 lary palpi broadly, equilaterally triangular, inserted at the corner. 

 Antennae subserrate, distal segment distinctly longer than penulti- 

 mate segment. Pronotum much broader than long, anterior angles 

 obtuse, not rounded. Scutellum fairly large, semicircular. Mesoster- 

 num produced posteriorly in the form of a rounded lobe. Posterior 

 coxae elongate, contiguous, meeting in a depressed sutural line ; ante- 

 rior margin of latter part closely connected with rounded lobe of 

 mesosternum. Anal style long, more than four times length of last 

 ventral segment, broadest at its basal fifth, then suddenly narrowed 

 and attenuate to apex, curved ventrad. Intermediate tibiae longer 

 than their tarsi, the latter filif orta ; posterior tibiae with but a single, 

 broad, flattened, tibial spur, concave on its anterior surface, convex 

 on its posterior surface. 



The genotype is Mordelloides acuticauda^ new species, described 

 below. 



MORDELLOIDES ACUTICAUDA. new species 



Figures 17, i; 19, h 



The single, flattened spur of the posterior tibiae, the semicircular 

 scutellum, the peculiar antennae, and other generic characters will 

 serve adequately to separate this species from any of its allies that 

 might superficially resemble it. 



Length : 2.3 mm. ; including anal style, 5.8 mm. Form moderately 

 robust, convex, suboval, sides attenuate, narrowing posteriorly, broad- 

 est near base of pronotum. Head castaneous, darkening evenly 

 caudad, piceous at occipital margin, mouth parts and antennae flavo- 

 castaneous, distal segment of latter somewhat fuscous in certain 

 lights; pronotum fuscous, sides broadly castaneous; elytra fusco- 

 castaneous, a broad, curved, humeral stria extending toward but not 

 reaching the suture, castaneous ; anterior and middle legs, posterior 

 tarsi, and middle of ventral abdominal segments, flavocastaneous ; 

 posterior tibiae and anal style brunneous. Surface densely covered 

 with fine, recumbent pubescence, yellowish on head, pronotum, and 

 elytra, condensed on latter part to form the following fasciae : a curved 



