LISTRUS. 125 
LISTRUS. 
Listrus, Motschulsky, Bull. Mose. iv. p. 389 (1859). 
Listrus is the American representative of the European Danacea: they are little 
beetles with depressed pubescence, but without erect hairs; and the front tibiee want 
the sete which distinguish Pristoscelis. 
Ten species have been described from California and the central States. 
1. Listrus cupreo-nitens. (Tab. VII. fig. 8.) 
Elongatus, subcylindricus, plumbeo-cinereus, cupreo-nitens, pube brevi cinerea densius vestitus, crebre obsolete 
et vix distincte punctatus; elytris ad apicem attenuatis, subgibbosis ; pedibus et antennis nigris. Long. 
4—4 millim. 
2 
Hab. GUATEMALA, Quiche Mountains, Quezaltenango, Capetillo (Champion). 
The whole upper surface, and sometimes the upperside of the femora, is clothed 
with a very fine, silky, close pubescence; and this, with the fine punctuation and 
metallic leaden or coppery tint, give it a beautiful “frosted” appearance. ‘The antenne 
have the apex of the basal and two or three of the succeeding joints pitchy red. ‘The 
head is even, without impressions; the thorax widens suddenly in the middle, where 
the width is rather greater than the length. 
2. Listrus subcyaneus. 
Elongatus, subcylindricus, paulo depressus, niger, supra subcyaneus, pube brevi parcissime vestitus, subtiliter 
crebre punctatus; elytris ad apicem parum attenuatis, subgibbosus, Long. 33-43 millim. 
Hab. Guatemata, Totonicapam (Champion). 
This insect is amply distinguished from L. cupreo-nitens by being wider and more 
depressed, and by being almost free from pubescence, as well as by its blue colour. 
The antenne often have the apical joint pitchy red. 
Ten specimens agree very closely in these characters ; two have the pubescence rather 
more uniformly spread over the whole upper surface; but it is still much shorter and 
thinner than in Z. cupreo-nitens. The head is usually more coppery than the rest of the 
body ; and the thorax is transverse, with appreciable hind and front angles. 
3. Listrus sneus. 
Elongato-ovalis, convexus, antice posticeque attenuatus, niger, supra eneus, nitidus, crebre haud profunde 
punctatus ; antennis pedibusque rufis, his tarsorum articulo ultimo, illis articulis tribus apicalibus et basali 
nigris. Long. 43 millim. 
Hab. Mexico, Oaxaca (Hoge); Guatemaia, Panima (Champion). 
Though there are but two specimens of this species, its distinctness from any other 
cannot, I think, be doubted, if the convex evenly oval form and the red legs are observed. 
The only species to which it approaches is L. corallipes; but it is nearly twice as large, 
