42 FAMILY IT. CARABID^E. 



Horn. "Synopsis of the Species of Cychrus Inhabiting Boreal 



America," in Trans. Amer. Ent. Soc., VII, 1879, 168-185. 

 Horn. Bull. Brook. Ent. Soc., I. 1879, 79-82. 



About 30 species of Cychrus are known from the United States. 

 Of these but five have so far been taken in Indiana, though two 

 others perhaps occur. 



KEY TO INDIANA SPECIES OF CYCHRUS. 



. Smaller, not over 15 nun.; front tarsi of male broadly dilated, those 

 of female nut dilated; maxilhe hidden beneath the broad cheeks; 

 legs stout. 

 h. Hind angles of thorax very >btuse; length 12-14 mm. 



c. Thoracic punctures very few. limited to the basal impressions; 

 elytral stria? interrupted only at apex. 21. STENOSTOMUS VAR. 

 <-<: Thorax with numerous punctures between and in the basal im- 

 pressions; elytral stria- interrupted behind the middle. 



22. LECONTEI. 



lil). Hind angles of thorax rectangular; elytral stria? interrupted on 

 sides and apex; length 11-12 mm. CANADENSIS. 



mi. Larger, ls-28 mm; front tarsi of male but narrowly dilated; maxilla- 

 exposed ; legs slender. 

 (L Thorax nearly as wide as elytra, the sides much elevated, the hind 



angles prolonged backward. 



e. Smaller, length less than 20 rnm. 23. ELEVATUS. 



<('. Larger, length more than 25 mm. 24. XJNICOLOR. 



(Id. Thorax much narrower than elytra, moderately reflexed. the hind 



angles not prolonged backward. 



/. Form robust; margins of thorax rather wide, distinctly reflexed. 



VIDUUS. 

 ff. Form slender; margins of thorax very narrow, not reflexed. 



25. ANDREWSII VAR. 



21 (82). CYCHRUS STENOSTOMUS INDIANA Leiig, MS. 



Oval, slender. Black ; elytra violaceous, their margins bluish. Thorax 

 broader than long, sides curved, strongly converging on basal half; hind 

 angles obtusely rounded; disk smooth, the basal impressions linear, deep, 

 with very few punctures. Elytral intervals slightly interrupted at sides. 

 UK. re distinctly on apical fourth, but not tuberculate. Length 11-12 mm. 



Marion, Posey, Crawford and .leimings counties; scarce. April 

 4-September 20. Mr. Chas. W. Leug. of New York City, who has 

 recently made ;i special study of North American Ci/dinix, states 

 that this is a distinct variety of slcmtslomus Web., which differs 

 from that species by the usually "total absence of the transverse 

 liasal impression of the thorax. " lie lias ui\-cn it the varietal name 

 indiancB, 



