TACHINUS.—TACHYPORUS. 311 
punctured than the thorax. Hind body closely and finely punctate, but little shining ; 
legs slender. 
In the male the lacinie of the last ventral plate are rather elongate, and are separated 
by a broad space, which is continued forwards as an elongate narrow fissure, the lateral 
margins of this fissure being slightly raised ; the penultimate ventral plate has a broad, 
shallow, sinuous emargination in the middle, and this portion of the hind margin is 
rough or file-like, with very minute asperities. The last dorsal forms in the middle a 
prominence, which is divided behind by an angular notch, so that it forms two short 
broad teeth at the extremity; and each outside angle of the plate is slightly produced 
so as to form a very short tooth, which does not extend so far back as the base of the 
central notch. 
Only a single individual has been found. 
4. Tachinus nimborum. 
Subdepressus, angustulus, nitidus, nigricans; prothoracis marginibus basali et laterali anguste picescentibus ; 
elytris puncto humerali piceo, antennarum basi pedibusque rufis ; pedibus fusco-testaceis. 
Long. 5 millim. 
Hab. GuaTEMALA, Quiche Mountains 7000 to 9000 feet (Champion). 
Antenne elongate; the tenth joint about as long as broad; the two basal joints 
obscure red. Thorax with a distant and fine punctuation. Elytra rather more coarsely 
and distinctly punctured. . 
Only a single female has been found; though extremely similar to 7. alticola, the 
colour is rather darker, except that the basal joints of the antenne are paler; hence it 
is probable that it is a distinct species, although only a female of 7. nimborum and a 
male of 7. alticola have been found. ‘Lhe structure of the terminal segment is similar 
to that of the corresponding sex of 7. inornatus, except that the spines of the ventral 
and dorsal plates are not quite so elongate. 
TACHYPORUS. 
Tachyporus, Gravenhorst, Mon. Staph. p. 1; Erichson, Gen. et Spec. Staph. p. 281. 
This genus, of about forty or fifty species, is confined to the northern and north- 
temperate regions of the two hemispheres, where the species are evenly distributed. 
It is well known that the species of the genus are characterized only by very feeble 
external characters, and the Central-American forms are no exception in this respect to 
what has been observed elsewhere. 
1. Tachyporus mexicanus. (Tab. VII. fig. 12.) 
Niger, nitidus ; antennis pedibusque testaceis, illis extrorsum fuscescentibus ; prothorace elytrisque testaceis, illo 
plaga magna picea, his sutura et ad latera anterius nigro signatis, abdominis segmentis posterius late 
rufo-cingulatis. 
Long. 43 millim. 
