106 GEO. n. HORN, M.D. 



C silptioidos. Linn. — Piceous black, shining, thorax broadly testaceous 

 at the sides, elytra with humeral spot, apical margin and suture testaceous. 

 Antennae piceous, two basal joints paler. Head and thorax very finely alutace- 

 ous. Elytra obsoletely punctulate, not alutaceous; humeral spot usually small, 

 apical testaceous margin wider externally, the sutural wider at each extremity. 

 Abdomen above punctured and more distinctly alutaceous than the thorax, 

 beneath finely punctulate and alutaceous at the sides. Legs pale testaceous. 

 Length .10 inchj 2.5 mm. 



Male. — Last ventral deeply notched, forming two triangular plates, sixth 

 ventral deeply notched at middle on each side of the notch a strong angulation 

 beyond which the margin is very oblique. Last dorsal with four slender teeth 

 the two median longer and more acute, (fig. 27, a, b). 



Female. — Last ventral with four slender processes, the two median somewhat 

 broader and longer. Last dorsal with four slender processes nearly equal in 

 length and similar in form, (fig. 27, c). 



In addition to the processes described for both sexes there are 

 on each side two others which seem to belong to the last dorsal 

 and ventral respectively. These are merely portions of the genital 

 arrangement. 



PHYSETOPORIJS n. g. 



Form robust as in Conosoma. Mentum transverse, narrower in 

 front, ligula dilated at apex deeply notched. Last joint of maxillary 

 palpi slender as in Tachiuus, twice as long as the preceding joint. 

 Antennae slightly longer than head and thorax, joints longer than 

 ■wide. Mesosternum strongly cristate. Hind tarsi with joints one to 

 four gradually decreasing in length. Anterior tarsi dilated in the 

 males. Abdomen feebly margined. 



The above genus, proposed for Coproporus grrossuhis, Lee, seems 

 intermediate between Tachinus and Erchomus. With the former it 

 agrees in the structure of the antennae, palpi and % tarsi, with the 

 latter it is allied by the structure of the mesosternum although instead 

 of being simply slightly carinate there is a very strong crest or plate 

 as in many Hydrophilidae. 



P. grossilliis, (Lee.) — Robust, convex, black, shining. Antennre piceous 

 four basal joints paler. Head and thorax very minutely punctulate and very 

 finely alutaceous. Elytra conjointly, broader than long, narrower posteriorly 

 and emarginate at tip, surface more distinctly punctulate and alutaceous with 

 the strigosity oblique. Abdomen more densely punctulate and alutaceous, be- 

 neath more distinctly punctulate. Legs pale testaceous. Length .16 — .18 inch; 

 4 — 4.5 mm. 



Male. — Last ventral deei)ly triangularly notched, sixth trisinuate at apex 

 and finely fimbriate at middle. Last dorsal acutely quadridontate, teeth 

 similar and equal. 



Female. — Last ventral deeply divided into six slender and acute processes, 

 the four middle processes equal, the lateral shorter. Last dorsal trilobed as in 

 Tachinus, the middle lobe broader than the outer but shorter and deeply divided 

 into two slender processes. 



