April, 1S44.] 33 



verse, base truncate, sides rounded and slightly marginatc, angles obtusely 

 rounded, anterior ones but slightly deflexed ; impunctured, rufo-testaceous, 

 dusky before the middle; shining: elytra longer than wide, impunctured, rufo- 

 testaceous, with the disk and region of the scutel dusky ; outer posterior angles 

 rounded, with the lateral edges slightly marginate : abdomen brown, with the 

 posterior margins of the segments rufo-testaceous, piceous ; very minutely 

 punctured on the anterior margins; sides of each segment with one or two 

 long black hairs : feet and postpectus rufo-testaceous ; antepectus testaceous. 



2. T. Umbatus. Pitchy-brown, impunctured ; thorax, lateral and apical 

 margins of the elytra, and feet testaceous ; head black. — 3 1. long. Pennsyl- 

 vania. 



About the size of memnonius, Grav. Head small, black, highly polished' 

 mouth piceous : palpi pitchy-rufo-testaceous : antennas, subfiliform, joints 

 subcylindric, third joint much longer than the second, second and fourth equal, 

 terminal ovate; brown in the middle, four basal joints and two terminal ones, 

 testaceous : thorax a little wider than the base of the elytra, transverse, sides 

 rounded, base rectilinear, angles obtusely rounded ; testaceous, tinged with 

 rufous on the disk; highly polished : elytra quadrate, longer than the post- 

 pectus, minutely and irregularly rugose, brownish, with the lateral and apical 

 margins testaceous; glossy: tergum punctured, punctures not crowded, dark 

 reddish-brown, with the posterior margins of the segments somewhat piceous: 

 antepectus and throat testaceous : venter and postpectus reddish-brown, the 

 former lighter colored at apex. 



Boletobius, Leach. 



1. B. dimidiatus. Black, shining; base of the elytra and feet rufous. 

 Erichson. Er. St. 1. 276. 13. 



Var. — Feet and only the exterior basal angles rufous. Taehyporus humera- 

 lis, Melsh. Catal. 1325. 



2. B. venustus. Testaceous; head, three angular spots on the elytra and 

 postpectus black; tergum rufous. — 1J 1. long. Pennsylvania. 



Tachinus trimaculatus, Say, Trans. Amer. Phil. Soc. iv. p. 464. 3. 



Head short, black, polished ; mouth testaceous : antennae hardly longer than 

 the thorax, brown, with four basal joints testaceous: thorax slightly narrower 

 than the base of the lytra, testaceous, glossy : elytra pale testaceous; region of 

 the scutel with a long acute triangular black spot ; exterior posterior angles, 

 each with a similarly colored spot ; dorsal series of punctures slightly impressed : 

 abdomen sparsely punctured, rufous, with the posterior margins of the segments 

 lighter colored ; apex testaceous : epipleura and postpectus black: antepectus 

 and feet testaceous. 



I have changed the name trimaculatus, as it had been previously applied 

 to a European species. 



3. B. binotalus. Rufo-testaceous; head, a round spot at the exterior 

 posterior angle of each elytrum, suture and epipleura black. — 1§ — 1| 1. long. 

 Pennsylvania. 



Taehyporus binotafus, Melsh. MS. 

 Doubtless only a variety of the preceding. 



