200 STAPHYLINID^E. [Tachiiius. 



be almost entirely of a fuscous colour j the antennae, legs, and cerci are yellowish, and 

 all the setse black. 



I. Last joint of maxillary palpi elongate, plainly longer 



than penultimate ; fourth joint of antennae plainly 



shorter than fifth ; hind body narrowed from base to 

 apex {Tachinus. i. sp.). 



i. Antenna? entirely black, at most base of two or three 

 basal joints lighter; elytra ferruginous brown, some- 

 times darker on disc ; sides of thorax sometimes 

 lighter, sometimes concolorous with disc T. flavipes, F. 



ii. Antenn£E black, or ferruginous red, with base 

 lighter. 



1, Length 6^-7 mm.; elytra bright red with 



apical margin, and sometimes suture, darker . . T. rufipennis, Gyll. 



2. Length 5-6 mm. ; elytra shagreened between 



punctures, duller. 

 A. Elytra ferruginous red, or black with base 

 more or less reddish testaceous. 



a. Sides of thorax rather broadly lighter. 



a*. Elytra nearly twice as long as thorax ; 

 anterior margin of thorax often (but not 



always) lighter than disc, 

 ftt- Penultimate joints of antennae longer; 



elytra ferruginous red, more or less 



iufuscate T. HUMEEALIS, Grav. 



bf. Penultimate joints of antennae shorter ; 



elytra always dark with base only 



reddish T, PEOXIMUS, Kr. 



b*. Elytra one and a half or one and one-third 



times as long as thorax, 

 af. Elytra narrower plainly longer than 



broad, with apical margin and a spot at 



shoulder reddish yellow T. pallipes, Orav. 



{frigidus, Er. ?) 

 bf. Elytra broader, subquadrate, with 



apical margin often concolorous with 



disc, and a rather large transverse space 



at shoulder more or less obscurely reddish 



yellow T. SCAPtTLAEls, Steph. 



b. Sides of thorax not, or obscurely lighter. 



a*. Antennte entirely ferruginous red with 

 base lighter; penultimate joints about as 



long as broad T. BIPUSTUIATUS, F. 



b*. Antennae dark with base testaceous ; pe- 

 nultimate joints plainly longer than broad . T. EUFIPES, De G. 

 B. Elytra black with a large broad bright yellow 

 band stretching from apex near shoulders to 



beyond middle T. subteebaneus, L. 



3. Length 3-4 mm. ; elytra not shagreened between 

 punctures, more shining. 



A. Elytra and thorax, except margins, black. 



a. Thorax as broad as elytra with margins dis- 

 tinctly lighter T. maegineilus, F. 



b. Thorax broader than elytra with margins 



obscurely lighter T. laticollis, Grav. 



B. Elytra and thorax ferruginous red T. collaeis, Grav. 



