THE LAMELLICORN BEETl-KS. 



1003 



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



Medium-sized beetles having the thorax rounded, narrower 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 TKICHIUS. 



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

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

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

 of male without spur. 1868. PIGER. 



lih. 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. 



I860. AFFINIS. 



'/*/. Elytra reddish-brown, tinged with green, without transverse whitish 

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



18G8 (593T). TRICHIUS PIGER Fab., Syst. Ent., 1798, 40. 



Oblong-oval. Head and thorax piceous. 

 tinged with greenish ; elytra reddish-brown to 

 piceous, 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, tibiae 

 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. 



I FMo- 401 " 1'ig- 421. Male and foreleg of frinalc 



(After Chittenden in bull. XXV11, New 

 .... e*. Ser., U. S. Div. Ent.) 



Throughout the State; frequent. 



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

 1hose of Jersey tea (Cuniollius), and wild hydrangea. The clypeus 

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

 more narrowed in front than in female. 



