284 STAPHYLINIDA. 
This species is allied to G. bicolor, but besides the differences in colour, it has the 
antennee and prothorax less elongate. The unique individual, in very bad condition, 
found by Mr. Champion is probably a female. 
TACHIONA. 
Tarsi crassiusculi, tibiarum tantum dimidio longitudinis, posteriorum articulo basali brevi, quam sequens 
vix longiore. Coxse intermedie distantes, acetabulis integris, mesosterno et metasterno inter se sutura 
recta arcte conjunctis. 
This genus is established for a peculiar Aleocharid of broad form, acuminate behind, 
and flat upper surface, and thus approaching in appearance to the genera Dinusa and 
Dinarda, to neither of which, however, does it appear to have any affinity. The tarsi 
are short and stout, and those of the hind legs are five-jointed ; but those of the anterior 
and middle legs I am tolerably certain are only four-jointed, so that the genus must be 
placed in the Bolitocharaires of Rey, where, however, it is apparently quite isolated. 
The head is very short and broad and is much immersed in the thorax, and the eyes 
are rather large ; the maxillary palpi are of the ordinary Aleocharid form ; the mentum 
has in front a broad semicircular emargination filled by a membrane, and the labial 
palpi are apparently short and inconspicuous, while the lobes of the maxille are elongate 
and prominent; the suture of the gene is without a raised margin, and the maxillary 
cleft is remarkably large. ‘The sides of the prothorax beneath are flat, but not inflexed, 
so that they are quite visible, and the prosternum is extremely short; the middle coxe 
are rather widely separated ; the mesosternum is but little produced between them, 
and is connected with the metasternum by a quite straight suture, which is placed as far 
forwards as the middle of the acetabulum ; there is no raised line on the side of the 
Wwing-case, and the metathoracic epimeron and the hind coxe are not prolonged so far 
outwards and upwards as to be visible from above or indeed from the side. 
1. Tachiona deplanata. (Tab. VI. fig. 21.) 
Lata, posterius acuminata, supra deplanata, capite, elytrorum angulo externo antennisque (basi excepto) nigris ; 
prothorace in medio abdomineque apicem versus nigro-maculatis ; prothorace valde transverso, angulis 
posterioribus discretis, obtusis. 
Long. 53 millim. 
Hab. Muxico, Cordova (Hége). 
Antenne thick, quite as long as head and thorax; the three basal joints yellow, 
broad; the third much longer than the second, which is remarkably short ; fourth 
transverse, a good deal narrower than those following it; fifth to tenth similar to one 
another, each very strongly transverse ; terminal joint elongate, about as long as the 
three preceding together. Head broad, but very much narrower than the thorax, 
sparingly punctate and pubescent, shining. ‘Thorax very transverse, rounded at the 
sides and a little narrower in front than behind, lateral margin very distinct, the surface 
