346 [December, 



b. Caput pone oculos raodice angustatuin ; elytra confuse punctata. 



3. M. n i g e r, niger vix snbtiliter pubescens, thorace valde transverse, late- 

 ribus rectis, angulis rotundatis, elytris subtilius scabro-punctatis, antennis, ab- 

 dominis apice, pedibusque piceo-testaceis. Long. '15. 



Lake Superior ; one male. The last superior joint of the abdonnen is elong- 

 ate, concave beneath, and has a short terminal appendage; the penis is exserted, 

 and terminates in two large acute hooked lobes. 



4. M. transversus, fuscus pubescens, thorace quadrato, angulis 

 prominulis, lateribus rectis, obsolete punctu'ato, ad medium transversim im- 

 presso, elytris subtilissime punctulatis, antennarum basi testacea. Long. 12. 

 Niagara. 



5. M. concavus, fuscus pubescens, thorace rufescente quadrato, angulis 

 prominulis, lateribus rectis, obsolete punctulato, subcanaliculato, ad angulos 

 anticos excavato, elytris subtilissime punctulatis, antennarum basi testacea. 

 Long. 'IS. New York. 



6. M. e X i li s Mels. Pr. Ac. Nat. Sc. 2, 305. Pennsylvania and Georgia. 



7. M. f r a g i 1 i s , fuscus vix pubescens, thorace transverse, tenuiter mar- 

 ginato, lateribus rotundatis, disco ad medium transversim impresso, elytris 

 vix subtiliter punctulatis, antennarum basi pedibusque pallidis. Long. -1. 



S. Carolina and Lake Superior ; differs from the preceding by the fuscous 

 thorax, which is more rounded on the sides. 



8. M. f u s c u I u s, fuscus vix pubescens, thorace transverse, tenuiter mar- 

 ginato, angulis vix rotundatis, lateribus rectis late impressis, elytris subtilis- 

 sime scabris. Long. 'IS. 



One specimen, San Francisco. The antennse and feet are entirely fuscous. 



8. M. p a r V u 1 u s, fusco-pallidus, parce pubescens, capite nigro, thorace 

 transverse lateribus rotundatis, non impresso, elytris vix punctulatis. Long. -OS. 



New York and Lake Superior. In addition to the characters above, this 

 species has much shorter antenna than the others, and the terminal articula. 

 tions are more rounded. 



Trypherus. 



Antennse tenues, articulo 2n<lo vixbreviore ; palpi maxillares articulo 2"do vix 

 longiore, ultimo subtriangulari longiore; tarsi postici articulis gradatim brevi- 

 oribus, articulo 4to valde bilobato; ungues simplices, paranychio lato rotundato, 

 intermedio muniti; elytra abdomine multo breviora; caput pone oculos vix 

 angustatum. 



The form of the palpi sufficiently distinguishes this genus from the preceding; 

 it approaches much closer to Telephorus. The male has a small additional 

 anal segment ; the female has the penultimate joint of the abdomen deeply 

 emarginate. In both sexes the superior segment is dilated, thickened at the 

 edges and emarginate at apex, so that it projects on each side of the lower 

 segment like a lateral appendage. 



Another genus with short elytra, from Panama, approaches very closely to 

 this, but the second and third joints of the antennse together are not longer than 

 the fourth ; the palpi are strongly securiform, and the last joint of the tarsi has 

 no appendage between the claws. 



1. T. 1 a t i p e n n i 5. Malthinus latipennis Germ. Ins. Nov. 72; Molor- 



