390 MEMOIRS ON THE COLEOPTERA 



tibiae; lateral tomentose line of the fifth segment much shorter 

 than in the male of viridulus. Female nearly like the male, except 

 that the head is smaller and the hind tarsi much shorter and evi- 

 dently more slender; the elytra, also, have two slender transverse 

 lines of tomentum on the flanks, the anterior very short, and the 

 lateral areas of pygidial tomentum extend across the base. 

 Length (cf 9 ) 9.5-10.8 mm.; width 5.3-5.4 mm. Alabama 

 (Mobile), Loding, and Florida. Two examples. 



rasilicauda n. subsp. 



C Nearly similar to rasilicauda in general appearance, coloration 

 and lustre throughout, except that the outline is more slender 

 and the abdomen red, the last segment more obscure; pygidium 

 similarly black, with violaceous lustre but with the crenulate lines 

 finer and feebler, well separated; head and prothorax similar but 

 less stout; elytra as in the male of rasilicauda but with the punc- 

 tures less coarse and not so rugose at the sides and with small 

 remnants of the usual two transverse tomentose lines on the 

 flanks; legs and tarsi nearly similar. Length (cf ) 9-3 mm.; width 

 4.8 mm. North Carolina (Southern Pines), Manee. 



rufiventris n. subsp. 



Body shorter, more abruptly ventricose, shining, deep and very uniform 

 blackish-blue in color throughout, the vestiture rather sparse and 

 inconspicuous, cinereous; head nearly as in viridulus in form and 

 sculpture; prothorax distinctly shorter, a fifth wider than long in the 

 male, otherwise nearly as in viridulus, except that the punctures are 

 rather stronger and that there is no evident impression of any kind 

 along the median line; scutellum with very fine pubescence and 

 smooth margins; elytra as in viridulus in form, sculpture and in 

 having two very small tomentose spots on the flanks, but they are 

 decidedly broader when compared with the prothorax; pygidium 

 as in viridulus in form, sculpture and size and disposition of the lateral 

 lines of tomentum, which have no tendency to spread across the base, 

 the tomentum of the fifth ventral also similar; under surface with 

 the long dense pubescence finer and whiter; hind tarsi more than twice 

 as long as the tibiae. Length (cf ) 9.0 mm.; width 4.5 mm. North 

 Carolina (Southern Pines), Manee. [Trichius lunulatus Fabr., and 

 carolinensis Csy.] The dash of tomentum behind the scutellum is 

 much more developed than in any of the preceding forms except 

 semiviridis lunulatus Fabr. 



The synonymy of this genus has been confused to a great degree, 

 ever since Burmeister placed all of the North American species, 

 excepting piger, under the specific name bibens. I am confident 

 that both assimilis and viridans, of Kirby, are species distinct from 

 affinis, as can be realized readily on viewing side by side the very 

 large series at hand. Assimilis does not occur on the Atlantic 

 coast but is the most abundant form of the genus in the Lake 

 regions; its larger size, stouter form and very long transverse 



