THE LAMELLIGORN BEETLES. 



loo:; 



XLI. Trichius Fab. 1775. (Gr., "hairy.") 



Medium-sized beetles having the thorax rounded, narrow er than 

 elytra, the latter short, almost truncate; pygidium prominent in 

 both sexes, that of male more convex than that of female and with 

 the tip somewhat inflexed. They occur upon flowers during the 

 day and readily take to flight when disturbed. Three of the six 

 known species have been taken in Indiana. 



KEY TO INDIANA SPECIES OF TRICHIUS. 



a. Elytra with white transverse bands and velvety spots on the sides. 

 6. Elytra with third and fifth intervals distinctly more convex than sec- 

 ond and fourth, the latter two rather densely punctate ; front tibiae 

 of male without spur. 1868. piger. 



hh. Elytra with third and fifth intervals but slightly convex, second and 

 fourth very sparsely punctured; front tibiae with spur in both 

 sexes, that of male more slender and straight than in female. 



1869. AFFINIS. 



aa. Elytra reddish-brown, tinged with green, without transverse whitish 

 bands or velvety spots on the sides. 1870. bibexs. 



1868 (5937). Trichius piger Fab., Syst. Ent, 1798, 40 



Oblong-oval. Head and thorax pieeous, 

 tinged with greenish ; elytra reddish-brown to 

 pieeous, sparsely pubescent, each with two 

 short, oblique whitish bars, one slightly in 

 front of, the other slightly behind the middle, 

 and reaching from the margin to the fifth, 

 rarely the third, interval ; sides with a black 

 or reddish velvety space reaching from the 

 margin to the fifth interval behind the front 

 bar and divided by the hind one; body be- 

 neath and femora piceous-bronzed, clothed 

 with long, white, silken hairs ; abdomen, tibice 

 and tarsi reddish-brown. Head and thorax 

 densely punctate, usually thickly clothed with 

 short, erect, yellowish hairs. Pygidium finely 

 rugose, sparsely pubescent, often with a whit- 

 ish scaly space on the sides. Length 9-11 mm. 

 (Fig. 421.) 



Fig. 421. Male^and [foreleg - oil female. 



(After Chittenden in Bull. XXVII, New 



Throughout the State; frequent.™- 

 June 3-July 24. Occurs on flowers of various kinds, especially 

 those of Jersey tea (Ceanothus), and wild hydrangea. The clypeus 

 of male is longer and the thorax much more densely pubescent and 

 more narrowed in front than in female. 



