28 GEO. H. HORN, M. D. 



In the figure of the mentum there will be observed a depression 

 on each side of middle with a brush of short hairs at bottom. This 

 is a male character, the female mentum being entirely plain. PL iii, 

 fig. 24, a, h, c. 



In 0. umbros^is Lee. % , the foveas are large and nari-owly sepa- 

 rated ; in longicornu Horn they are small and widely separated, and 

 in lugubris Horn the fovese forms but one transverse depression. 

 Males of fasciatus are not now before me. 



0. guttnlatus Lee. should be dropped from our lists, as there was 

 never a type in hand from which to make a description. 



LAGRIID^. 



This family is represented in our fauna by a small number of spe- 

 cies which have never been treated collectively, consequently their 

 determination is difficult, the names having been transmitted from 

 one cabinet to another in a traditional manner. 



Two genera are recognized in our fauna : 



Head not constricted to a neck, eyes transverse, reniforin, not prominent. 



Artliroiiiacra. 

 Head constricted behind the eyes, which are large, convex and prominent. 



Statira. 



The tibite are usually described as having no terminal spurs, but 

 in all the species before me the spurs are distinct, but very small. 



ARTIIROMAC'RA Kby. 



A. ieiiea Say [Lagria), Long's Exped. ii, p. 287; edit. Lee, i, p. 191 ; donaci- 

 oides Kby., Fauna Bor. Am. p. 238. — Body beneath and legs dark bronze, abo%'e 

 usually with brilliant metallic lustre, either blue, green, cupreous, or dark 

 bronze. Autenufe reddish-brown, tarsi somewhat darker. Head and thorax 

 sparsely punctate, the latter cylindrical, longer than wide, the base slightly ex- 

 panded, lateral margin entirely obliterated. Elytra rarely with faint traces of 

 strise near the apex, the surface coarsely and moderately closely punctate, some-' 

 times rugose. Body beneath very sparsely punctate. Length .37 — .50 inch ; 

 9.5 — 13 mm. 



In the male the last joint of the antennte is equal to the four pre- 

 ceding joints, in the female to three. The outer edge of the tibiae is 

 rounded, as in the majority of our species of Statira. 



STATIRA Serv. 



Our species are few in number, and may be distinguished in the 

 following manner : 



