THE ANT-LOVING BEETLES. 



313 



VII. Tyrus Aube. 1833. (Without meaning.) 



Antennas clavate; palpi with first joint minute; second long, 

 curved; third short, obovate; last joint with a needle-like spine at 

 apex ; third tarsal joint longer than second. Two species probably 

 occur in the State. 



KEY TO INDIANA SPECIES OF TYRUS. 



a. Antennae rather elongate in both sexes, the next to last joint of funicle 

 not transverse ; carinse of abdomen well developed. 



598. HUMERALIS. 



aa. Antennae shorter and stouter, the three outer joints of funicle trans- 

 verse in female; thorax a little wider than long; carinae of abdomen 

 very short and inconspicuous. consimilis. 



598 (1875). Tybus humeealis Aube, Ann. Ent., II, 1836, 84. 



Robust, compact. Piceous-black, clothed with fine, short appressed hairs ; 

 elytra, antennae and legs reddish-brown. Head as long as broad, with two 

 small foveae between the eyes. Antennae of male with joints one and two 

 cylindrical ; 3-7 rounded, gradually smaller ; eighth and ninth larger, globu- 

 lar ; tenth obconical, twice as long and thick as ninth ; eleventh largest, 

 ovate; female with joints 3-9 subequal, tenth larger. Thorax bell-shaped, 

 widest at middle; disk with a median rounded fovea and a fine, transverse 

 sulcus near base. Elytra with humeri prominent, disk very finely and 

 sparsely punctate ; each with a deep impressed line and fovea on basal 

 half. Abdomen but little longer than elytra, margins very broad, the last 

 dorsal notched at tip in male. Length 1.6 mm. (Fig. 146, d.) 



Southern half of State; scarce. April 16-June 18. Taken by 

 sifting and from beneath bark of stumps. 



T. consimilis Casey, reddish-brown, elytra paler, length 1.8 mm., 

 was described from Kentucky and Indiana, I have not seen a 

 specimen from the State. 



VIII. Hamotus Aube. 1844. (Gr., "like + ear.") 



Head not constricted behind the antennal tubercles ; third joint 

 of maxillary palpi very small, subglobular ; last joint long and cy- 

 lindrical ; pubescence yellowish, loose, coarse and long ; elytra and 

 abdomen very convex ; second and third tarsal joints equal. One 

 species is known. 



599 (1876). Hamotus batrisioides Lee, N. Sp. N. Amer. Col., I, 1863, 27. 

 Elongate-oval, convex. Fuscous-brown, shining. Head as broad as 



long, very convex ; vertex with two small foveae. Antennae nearly as long 

 as body ; first and second joints cylindrical, thicker than third to fifth, 

 which are quadrate and gradually smaller ; sixth to tenth a little wider ; 

 eleventh pear-shaped, subcompressed, half as long as the preceding joints 

 together, somewhat smaller in female. Thorax as wide as long, sides 



