COLEOPTERA. 335 



LoMECHusA, Aleochara, Grav. 



No spines on the tibiae; the antennae, 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 Callicerus, Gravenhorst, is unknown to me. The 

 Stenosthetus of Megerle, mentioned in the Catalogue, &c. 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 withoiit an elevated marg'in; such are the 

 Aleocharac hipundata, lanuginosa, nitida [Stuphylinus hipustulatus, L.; Ollv., Col., 

 Ill, 42, V, 44), fumatu, nana, Gravenh., or his families III — VI, Col. Microp., II. 

 The margin of the. thorax is turned up in the otliers forming his genus Lomechusa.- 

 L- paradoxal Staphyllnus emarginatus, Oliv., lb., ii, 12; — L. dentata, Grav.; Sta- 

 phyUnus strumosus, Payk., V. 



(2) Oxyporus subtcrraneus, Fab.; — 0. hipustulatus, ejusd., Panz., Faun. Insect. 

 Germ., XVI, 21; — 0. marginellus, Panz., lb., IX, 13; StaphyUnus fuscipes, Ih-, 

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

 latus, Ibid., XXII, 19, 15; — StaphyUnus atricapillus, F. ; — Oxyporus merdarius, 

 Panz., Ibid., XXVI, 18; — StaphyUnus striatus, Oliv., lb., v, 47; 'S'. lunaius, 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 atricapillus, 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. marginatus, F.; Panz., 

 lb., 17;— 0. chrysomelinus. Fab.; Panz-, lb., IX, 14;— 0. analis. Fab.; Panz., lb., 

 XXII, 16; — 0. abdominalis. Fab. 



