810 



FAMILY XL. LAMPYRIDJE. 



subfamily belong eleven genera, five of which are represented in the 

 collection at hand, while members of three others probably occur 

 within the State. 



KEY TO INDIANA GENERA OF LYCTNiE. 



a. Under side of thorax (except in Ccenia) with a prominent tubular spira- 

 cle behind and at the outer extremity of the front coxa?. 

 1). Front prolonged into a beak; mouth anterior; antennae with third 

 joint scarcely as long as fourth. Lycostomvs. 

 &&. Front swollen between the antennae, the beak wanting; mouth de- 

 flexed, inferior. 



c. Antenna? much compressed. I. Calopteron. 



cc. Antennae pectinate. 



d. Intervals of elytra with double rows of coarse quadrate reticu- 

 lations; spiracle of thorax not tubular and prominent. 



Ccenia. 



dd. Intervals with single rows of quadrate impressions; spiracle of 

 thorax prominent. II- Celetes. 



aa. Under side of thorax without a prominent tubular spiracle. 

 e. Elytra costate, cross-barred or reticulate. 



/. Disk of thorax strongly carinate, its sides also divided by an 

 oblique ridge from the hind angles. Lopheros. 

 ff. Disk of thorax scarcely or not carinate. 



g. Thorax many celled, the sides divided by a strong transverse 

 ridge. HI- Eros. 



gg. Thorax without distinct cells, feebly channeled behind the mid- 

 dle, its sides not divided by a transverse ridge. 



IV. Plateros. 



ee. Elytra substriate, not costate or cross-barred ; beak short and broad ; 

 thorax with thickened sides and short oblique ridges. 



V. Calochromtjs. 



Lycostomus lateralis Melsh., black, apex and sides of thorax and 

 sides of elytra as far as middle, dull yellow, length 8-10 mm., has 

 been recorded from near Cincinnati. 



I Calopteron Guer. 1830. (Gr.. " beautiful + wing.") 



This genus comprises our largest species of the family. In them 

 the elytra gradually widen from base to apex and are each marked 

 by six costa? with rows of transverse cells in the intervals. The an- 

 tennas are long and strongly compressed, with the outer joints fre- 

 quently broader than the others. Disk of thorax rather strongly 

 carinate. the sides reflexed. Two species are known from Indiana. 



1536 (4775). Calopteron terminals Say. Journ. Phil. Acad. Nat. Sci.. III. 

 1823, 178 ; ibid. I, 45, pi. 21. 

 Elongate, triangular, depressed. Black, sides of thorax and basal two- 

 thirds of elytra yellow; apical third of elytra purplish-black. Thorax 



