50 FAMILY II. CAKAP.ID.3i;. 



Common along streams and margins of ponds and lakes through- 

 out the State. April 3-Deeember 25. One specimen from Putnam 

 County was taken on the latter date, indicating that the species 

 probably hibernates in the imago stage. 



VI. BLETIIISA Bon. 1813. (Gr., "to throw.") 



Resembling El<ii>lu-us but much larger, with proportionally nar- 

 rower head and smaller eyes. Head and thorax parallel, the for- 

 mer Avith a deep groove each side; last joint of maxillary palpi- 

 short. They live during summer near rain pools or small bodies of 

 water. One of the four species known from the United States has 

 been taken in Indiana, Avhile another perhaps occurs. 



KEY TO INDIANA SPECIES OF BLETHISA. 



a. Thorax quadrate, smooth above and beneath except in the basal im- 

 pressions ; length 15 mm. QUADRICOLLIS. 

 na. Thorax subcordate, finely and densely punctate beneath ; length 12 mm. 



MULTIPUNCTATA. 



40 (164). BLETHISA QUADRICOLLIS Hald., Proc. Phil. Acad. 



Nat. Sci., III, 1847, 149. 



Blackish or coppery bronze above ; black beneath. Thorax 

 quadrate, sides feebly curved, margins strongly reflexed, 

 basal impressions sparsely punctate, hind angles obtusely 

 rounded. Elytra striate, punctured, each with about ten 

 fove;e arranged in three rows. Length 15 mm. (Fig. 38.) 



Represented in the collection by a single specimen, 

 taken August 15 from beneath rubbish near a deep 

 Fig 38 Pl i ]1 t ne cen ter of a tamarack marsh, one half mile 

 (After Leng.) south of DeLong, Fulton County. Specimens from 

 Lake and St. Joseph counties are in the Wolcott and 

 Field Museum collections at Chicago. 



B. multipunctata Linn, has been taken in Michigan and northern 

 Illinois, and doubtless occurs in the northern third of Indiana. 



Tribe V. NEBRIINI. 



Species of small or medium size, mostly black in color; antennae 

 with four basal joints glabrous; mandibles Avith bristle-bearing 

 puncture on outer side ; elytra margined at base. Prosternum pro- 

 longed behind the coxa 1 . the cavities open behind; hind co\-e touch- 

 ing. Five genera represent Hie tribe in the United States, two of 

 which occur in Indiana. 



