[September 1883 BULLETIN BROOKLYN ENTOM. SOC. VOL. VI. ol 
' SYNOPTIC TABLES OF COLEOPTERA. 
‘TACHYCELLUS “orw, 
By Geo. H. Horn, M. D. 
This genus differ from Bradycellus in having three joints of the antennz glabrous, 
The third joint and even the first two are not entirely hairless, but they have not that 
fine pubescence which occur in the following joints. 
Our species are as follows : 
Elytra with the entire number of strize. 
Hind angles of thorax rectangular. 
Black, legs black (except the base of tibize); base of thorax impunctured...... 
nigrinus. 
More or less testaceous, legs pale. 
Thorax wider at base than long, its color piceous with a very narrow pale edge 
Kirbyi. 
Thorax not wider at base than long. 
Thorax testaceous with large central piceous spot............... atrimedius. 
IMGs: TESECSUIS AAD Has ae SeIRMEINA 6 Gott cir neeniotin tas OSlobR aoe Es nebulosus, 
Helin amos olmorak OSE Alvis... . «sey Ape ER at a)s isles, ePssnern ode badiipennis. 
Elytra nearly smooth, the two strize nearest the suture alone impressed....... nitidus. 
The males of these species (except nitidus) have distinct squamules on the middle 
tarsi. In nitidus the second ventral segment at middle has two small pubescent spots 
the one behind the other. In Bradycellus the existence of one spot is usual, but it has 
never been observed in any other Tachycellus. 
T. nigrinus Dej. (Harpalus) Spec. IV, 399; Mann. Bull. Mosc. 1843, II, p. 213; 
Motsch. Kaef. Russl. 22 ; quadricollis Lec. (Geobeenus) Ann. Lyc. IV, 405. var. 
tibialis Kirby, (Trechus) Fauna Am. Bor. IV, 46. Length 5.5 to 6.5 mm. 
Alaska, Cal. Can. 
The form described by Kirby differs only in having the hind angles of the thorax 
less distinct than in the typical form. 'The number of specimens now in hand makes 
it possible to place tibialis as a synonym as was intimated by Dr. Leconte (Proc. Ac. 
1868, p. 382,) 
fT. Kirbyi n. sp. Piceous, shining, elytra with base and sides paler, legs testaceous. 
Head smooth, antennze piceous, three basal joints paler. Thorax broader than 
long, sides moderately arcuate in front, slightly sinuate posteriorly, hind angles 
acutely rectangular, dise feebly convex, lateral margin narrowly rufous, median 
line rather deeply impressed, basal impressions broad, but not deep, coarsely and 
sparsely punctured. Elytra piceous, paler at base and sides and often along the 
suture, basal margin interrupted at the scutellar stria, which is moderately long, 
surface rather deeply striate, intervals slightly convex. Body beneath smooth. 
Length 24 inch. 6 mm. 
This species has the form of badiipennis, but has the hind angles of the thorax 
acutely rectangular, in this respect it'agrees with atrimediws which is however a more 
elongate and parallel species, very differently colored. 
Described from specimens collected by Mr. Johnson Pettit near Grimsby, Ontario. 
octurs also in Ohio. 
