442 FAMILY XI. — STAPITVLIxrD-H. 



The one paper treating of the North American species of the 

 subf p.mily is by 



Hor)i. — "Synopsis of the Genera and Sp;^cies of the Staphylinid 

 Tribe Tachyporini of the United States," in Trans. Amer. 

 Ent. Soc, YI, J 877, 81-128. 

 The snbfiimily is separated into five tril)cs, and these in tnrn into 

 genera. 



KEY TO TRIBES OF TAOHYPOKIN.K. 



(/. Hind coxffi trausvei'se, reaching the side pieces of the metathorax. 

 ft. Antennae 10-jointed; tarsi 4-jointed. 



Tribe I. HypocyPTiNi, p. 442. 

 6&. Antennie 11-jointed ; tarsi 5-jointed. 



c. First joint of hiurt tarsi nearly as long as tibiae ; hind coxae ap- 

 parently nnited with the metasternuin. 



Tribe II. Triohoptini, p. 442. 

 cc. First .1oint of hind tarsi moderate or short ; hind coxte free. 



d. Head not margined on the sides beneath the eyes ; elytra dis- 

 tinctly longer than the thorax, minutely and irregularly punc- 

 tate. Tribe III. Tachypobini, p. 443. 

 (Id. Head margined on the side beneath the eyes; elytra about as 

 long as thorax, smooth or with three or more rows of punc- 

 tures. Tribe IV. BouTOBnNi, p. 452. 

 aa. Hind coxae triangular, prominent; antennas 11-jointed; tarsi 5-jointed; 

 head not margined. Tribe V. Habroceeini, p. 457. 



Tribe I. HYPOCYPTINI. 



Very small, broadly oval pubescent species, which occur for the 

 most part in the nests of ants. When disturbed they bend the head 

 under the body which, together with their convex forms, gives them 

 the appearance of little globes or balls. No representative of the 

 (ribe has lieen taken in the State, though Dury has taken Microciip- 

 lus Irslacfiis Lee. from the nost of a small black ant near Cincin- 

 nati. It is reddish-yellow, with Hie middle coxaj narrowly sepa- 

 rated; niesosternum carinate : leiigi:h .8 mm. 



Hyporijptii:^ loiifjiconiis Payk., black, legs and antenna> pale yel- 

 low, middle ( ()\;p widely separated, mesostemum flat, lengtli 1 mm., 

 may occiu' in the southern half of the State. 



Tribe II. TRICHOPYINI. 



Two genei'a represent this tribe in the Eastern Fnited States, 

 both of which occur in the nests of white ants (Tmucs). Both 

 genera have a southern range and both are perhaps reju'esented in 

 southern Indiana, though only the single sjK^cies of -one has as yet 

 been taken. 



