CETONIIISLE 389 



smooth margin very narrow; elytra distinctly shorter than wide, 

 with two sets ot double incised striae, the punctuation very irregular: 

 flanks punctured and subrugulose, having two very small spots of 

 tomentum; pygidium (cf ) about as long as wide, rather strongly 

 convex, subumbonate near the apex, or (9) distinctly broader, 

 almost as convex though flat apically, having in both sexes a slender 

 lateral spot of white tomentum, the spots never tending to extend 

 inward across the base; anterior tibiae differing sexually as in bibens, 

 the hind tarsi twice as long as the tibiae (cf ), one-half longer than 

 the tibiae ( 9 ) ; abdomen with a long transverse tomentose spot at 

 each side of the fifth segment, shorter in the female. Length (cf 9 ) 

 9.0-10.7 mm.; width 4.6-5.7 mm. Louisiana and Texas. [Trichius 



viridulus Fabr. ; virens Linn.] viridulus Fabr. 



A Nearly similar to viridulus in general form, sculpture and color- 

 ation but not quite so stout and with the elytra testaceous, with 

 feeble green lustre, darker green at the humeri and external apical 

 angles, the head nearly similar but the clypeus is feebly reflexed 

 laterally and the callus of the vertex is not so well defined, the 

 punctures in that region merely somewhat sparser; prothorax 

 similar in form in the sexes and distinctly wider than long, with 

 tomentum near the hind angles in the female; elytra almost similar 

 in outline but with the punctures everywhere sparser and with the 

 posterior of the two lateral tomentose lines much longer, pene- 

 trating a third to half way across the elytron; pygidium similarly 

 convex and sexually modified, but only very little wider in the 

 female and, in both sexes, with the larger lateral tomentose areas 

 arching inward at base, becoming only very narrowly separated 

 at the middle of the base, the crenulate incised lines finer and still 

 much more remote than in viridulus and more or less disintegrated, 

 especially in the female. Length (cf 9 ) 9.5-10.5 mm.; width 

 5.2-5.5 mm. Florida (Marion Co.). [Trichius semiviridis Csy.] 



Two examples semiviridis Csy. 



B Similar in outline and general features of sculpture to semiviridis 

 but black throughout, with deep violaceous lustre, the elytra pale 

 red-brown, shining, but without trace of metallic lustre of any 

 kind; pubescence only moderate in length or density, not con- 

 spicuous, the pygidium very shining and subglabrous, with the 

 sparse hairs very minute and decumbent; head well developed and 

 throughout nearly as in viridulus in form and sculpture; prothorax 

 (cf ) rather large, not quite as long as wide, the sides slightly con- 

 verging from the base, oblique apically; scutellum with scarcely 

 any smooth margin; elytra formed as in the preceding, with fine, 

 sparse and inconspicuous punctures, which, on the flanks however, 

 are rather coarse and close-set, giving a rugose aspect, differing 

 considerably from the small sparse punctures of the smoother flanks 

 in semiviridis, the flanks (cf) without tomentose spots; pygidium 

 (cf ) as long as wide, convex, subumbonate apically, the transverse 

 incised zigzag lines well separated, the line of white tomentum 

 at each side long, rather narrow, not extending inward at base in 

 the type; hind tarsi very long, more than twice as long as the 



