THE SAP-FEEDING BEETLES, 



tral segments; legs short, somewhat stout, retractile or partly so; 

 tarsi short, usually dilated arid hairy beneath, usually five-jointed, 

 with the fourth joint very small, rarely four- or three- jointed. 



Practically the only available paper treating of the North Amer- 

 ican species of the family is that of 



Horn. — -"Revision of the Nitidulidas of the United States," in 

 Trans. Amer. Ent. Soc, VII, 1870, 267-336. 



About 120 species of the family, divided among 32 genera, are 

 known from North America. Of these 49 species, belonging to 22 

 genera, have been taken in Indiana. For convenience the family 

 was first divided by Horn into eight tribes, seven of which are rep- 

 resented in the collection at hand. 



KEY TO INDIANA TRIBES OF NITIDULlDvE. 



a. Antennae 11-jointecl, ending in a three-jointed club;* all the tarsi similar 

 in both sexes. 

 1). Tarsi 5-jointed. 



c. Labrum free, more or less visible ; color rarely shining black. 

 d. Maxillae with two lobes ; antennal club elongate, loose. 



Tribe I. Beachyptekini, p. 629. 

 dd. Maxillae with one lobe; antennal club rounded, compact. 

 e. Thorax not margined at base ; head horizontal. 

 f . Abdomen with two or three segments exposed. 



Tribe II. Carpophilini, p. 631. 

 ff. Abdomen wholly covered or with but one segment exposed. 



Tribe III. Nitidttlini, p. 635. 

 ce. Thorax margined at base, covering the base of elytra ; head 

 more or less bent downward. 



Tribe IV. Cychramini, p. 645. 

 cc. Labrum united with the front or lower part of face ; color usually 

 shining black or piceous with reddish or yellow markings. 



Tribe VI. Ipini, p. 648. 

 &&. Tarsi four-jointed; body contractile; thorax margined at base, cover- 

 ing the base of elytra. Tribe V. Cybocephalini, p. 647. 

 aa. Antennae 10-jointed, the club two-jointed ; hind tarsi of males 4-jointed. 



Tribe VII. Rhyzophagini, p. 650. 



Tribe I. BRACHYPTERINI. 



The members of this tribe occur usually on flowers and have 

 the antennal club gradually formed and not of compact construc- 

 tion ; maxilla? with two lobes ; labrum distinct, usually small, often 

 deeply emarginate. The males have a small additional apical dorsal 

 segment. Four genera constitute the tribe, two of which are rep- 

 resented in Indiana. 



*In some species of Cercus the club has but two joints. 



