MACROBASIS.—GNATHOSPASTA. 403 
rufo-testaceous) ; in the female the basal joint is shorter and less dilated, and the third 
is a little longer than the second or fourth. ‘The anterior tibiz have two spurs in the 
male. MM. basalis approaches M. segmentata in the structure of the antenne; it very 
closely resembles the cinereous variety of Epicauta cinerea, but may be known at once 
from that insect by the third joint of the antenne being much less elongate, not or 
very little longer than the second. 
GNATHOSPASTA. 
Gnathospasta, Horn, Trans. Am. Ent. Soc. v. p. 154, fig. (mouth-parts) (1875). 
This genus is closely allied to Epicauta and Macrobasis, but differs from both in the 
very deeply emarginate labrum, and in the largely-developed, prominent, pincer-like, 
unemarginate mandibles. A single species, G. mimetica, from Texas, is included in it 
by Dr. Horn. Cantharis (Macrobasis) labialis, Dugés *, is a true Gnathospasta, and 
apparently only differs from G. mimetica by its black (not cinereous) pubescence. The 
anterior tibie of G. labialis have two spurs in both sexes—the inner one slender, acute, 
and curved, the outer one very long and stout, concave, and truncate at the tip,—a 
character not mentioned by Dr. Horn or Dugés. The basal joint of the antenne in the 
male, as in various Macrobases, is flattened and elongated, and sinuate on the outer 
side towards the tip. 
1. Gnathospasta labialis. 
Cantharis labialis, Dugés, La Naturaleza, v. p. 145, t. 4. figg. 9, 9a-d (mouth-parts and antennz) 
(1881) °. 
Macrobasis labialis, Dugés, An. Mus. Michoacano, ii. p. 51. 
Hab. Mexico, Pénjamo in Guanajuato (Dugés! 2). 
Described from abraded examples, which were found mixed with a large quantity of 
Cantharine collected at Pénjamo for medicinal purposes. The antenne of the male are 
described and figured as having their first joint about three times as long as the second, 
curved, and emarginate internally beyond the middle (so that the interior edge appears 
to be angularly dilated), the second joint cylindrical, and the third one half the length 
of the first. 
The head is very large in both sexes. It is not unlikely that G. labialis will prove 
to be inseparable from G. mimetica, Horn. Of G. labialis we have received two males 
and one female; a single example only (¢ ) of G. mimetica served Dr. Horn for his 
description. 
* In rejecting this species from Macrobasis, antea, p. 395, I have incorrectly stated that it belongs to 
Epicauta. 
3 FF 2 
