332 INSECTA. 



Stenus, Lat. 



The antennae inserted near the internal margin of the eyes, and 

 terminated in a triarticulated clubj extremity of the mandibles fork- 

 ed; large eyes. 



S. 2-guttatus; Staphylinus 2-gutiatus, L. ; Panz.Faun. Insect. 

 Germ., XI, 18. About two lines in lengtli; all black, with a 

 reddish dot on each elytron(l). 



The third section — Denticrura, Lat. — differs from the second in 

 the maxillary palpi, which are much shorter than the head, and al- 

 ways consist of four distinct joints; the anterior tibiae, at least, are 

 dentated or spinous along their exterior *side. The last joint of the 

 tarsi, which in most of them are bent under the tibiae, is as long as 

 all the preceding ones together, or longer; the first, or two first, are 

 usually so small or so concealed that the whole number does not ap- 

 pear to exceed two or three. 



The fore- part of the head, and even the thorax, is armed with 

 horns in several males. The antennae are inserted before the eyes. 



Some, whose palpi have a fusiform termination, whose antennae 

 are mostly granose and gradually enlarge towards the extremity, 

 present but three distinct joints in the tarsi(2). 



OxYTELus, Grav.(3) 



The others have filiform palpi, and at least four very distinct 

 joints in the tarsi. 



OsoRius, Leach, Dej. 



The body cylindrical; all the tibiae widened and dentated; the head 

 as long as it is wide; thorax almost cordiform, narrowed and trun- 

 cated posteriorly; the greater part of the antennae granose, insensibly 

 enlarging towards the extremity, and shorter than the head and tho- 

 rax; mandibles much shorter than the head, crossing considerably, 

 and terminating in a simple point; mentum large and scutiform. 



(1) Add Staphylinus Juno, Payk. ; — Peederus proboscideus, Oliv., Col. Ill, 44, I, 

 5; — Staph, clavicornis, Panz., Faun. Insect. Germ. XXVII, 2. See Gravenhorst, 

 Coleop. Microp.; Lat, Gener. Crust, et Insect, genus Stenus, and Gyll., Ibid. 

 p. 463. 



(2) With the exception of the Tachini, the anterior tarsi are no longer re- 

 markably dilated. 



(3) See Encyc. Method., article Oxitelu; the Monog. cit. of Gravenhorst, and 

 the Insect Suec, Gyll., I, pars II, p. 444. 



