COLEOPTERA, 335 



Lomechusa, Aleochara, Grav. 



No spines on the tibiae; the antennas, from the fourth joint, form- 

 ing a perfoliaceous mass, or elongated and fusiform; palpi subulate; 

 antennae frequently shorter than the head and thorax(l). 



Tachinus, Grav. 



Tibiae spinous; antennae composed of pyriform joints, and insen- 

 sibly enlarging; palpi filiform(2). 



Tachyporus, Grav. 



Similar to Tachinus in the tibiae and antennae, but the termination 

 of the palpi is subulate(3). 



The genus Callic^rus, Gravenhorst, is unknown to me. The 

 Stenosthetus of Megerle, mentioned in the Catalogue, Sec. of De- 

 jean, presents all the characters of a true Pselaphus, and must be 

 suppressed such also is now the opinion of this last named natu- 

 ralist. 



(1) In some, the thorax is smooth and without an elevated margin; such are the 

 Aleochara: blpunctata, lanuginosa, nitida {Staphyllnus bipustulatus, L.; Oliv., Col., 

 Ill, 42, v, 44), fumata, nana, Gravenh., or his families III VI, Col. Microp., II. 

 The margin of the thorax is turned up in the others forming his genus Lomechusa; 

 L. paradoxa; Staphyllnus emarglnatus, Oliv., lb., ii, 12; L. dentata, Grav.; Sta- 

 phyllnus strumosus, Payk., V. 



(2) Oxyporus subterraneus, Fab.; 0. bipustulatus, ejusd., Panz., Faun. Insect. 

 Germ., XVI, 21; 0. marglnellus, Panz., lb-, IX, 13; Staphyllnus fusclpes, lb., 

 XXVII, 12; Oxyporus suturalis, lb., XVIII, 20; 0. pygmasus, lb., 27; 0. lunu- 

 latus, Ibid., XXII, 19, 15; Staphyllnus atricaplllus, F. ; Oxyporus merdarius, 

 Panz., Ibid., XXVI, 18; Staphyllnus striatus, Oliv., lb., v, 47; S. lunatus, L. 

 See also for this, as well as the following subgenus, the Insect. Suec, Gyll., I, 

 pars I. Some excellent remarks will there be found respecting the sexual dif- 

 ferences of several species, the application of which may be rendered highly 

 useful. 



Those Tachini in which, as in the atricaplllus, the thorax is nearly as long as it 

 is wide, the muzzle advances, the four posterior tarsi are evidently longer than 

 their respective tibiae, appear to form a particular division. 



(3) Oxyporus rufipes, Fab., Panz., lb., XXVII, 20; 0. marglnatus, F.; Panz., 

 lb., 17; 0. chrysomellnus, Fab.; Panz., lb., IX, 14; 0. analls, Fab.; Panz., lb., 

 XXII, 16; 0. abdominalis, Fab. 



