MORGAN HEBARD 
311 
The species of the present genus differ from those of Labia in 
having a distinctly Spongiphorine facies and in having the fourth 
antennal joint decidedly shorter than the thirdd° 
Genotype. — Microvostox alter [Spongovostox alter] (RuiT)d^ 
In linear arrangement, Microvostox is found to follow Spongo- 
vostox, preceding Prosparatta, which is the last of the known genera 
of the Spongiphorinae. 
Generic Description. Size small to minute; form weakly de- 
pressed, hardly more so than in many species of Labia. Head 
with sutures subobsolete, occiput weakly convex. Eyes small, 
their length appreciabl}" less than that of the cheeks. Antennae 
with first joint moderately stout, nearly as long as combined 
length of second and third joints; second minute; third elongate 
and slender; fourth only slightly more than half as long as third, 
but (two times) longer than broad; succeeding joints moreelongate 
in increasing ratio distad, cylindrical. Pronotum subquadrate; 
prozona weakly convex, metazona deplanate, except narrowly 
niesad, where a slight convexity is indicated. Abdomen with 
fourth and fifth dorsal segments showing on each side a 
weak, rounded, lateral carina. Penultimate ventral abdominal 
segment of male subrectangulate; preceding segment much wider 
than other more proximal segments. Tarsi with ventral sur- 
faces supplied with short hairs. First tarsal joint as long as com- 
bined length of second and third joints; second joint very small. 
In addition to the species recorded below, a male specimen of 
P[salidophora] pygniaea Dohrn, from Madeira-Marmore R. R. 
Company Camp 41, Rio Madeira, Brazil, shows the species to be 
a member of the present genus. 
It is highly probable that all of the small tropical American 
Spongiphorines discussed by Burr,^- as well as Labia mexicana 
Bormans, Labia tricolor Kirby and Labia schwarzi Caudell, are 
members of the present genus. 
In minor (Linnaeus), genotype of Labia, the fourth antennal joint is as 
long as the third, in other species of the genus somewhat shorter, hut never 
decidedly shorter. 
Ann. k.-k. Naturhist. Hofmus. Wien, xxvi, p. 336, (1912). 
12 Ann. k.-k. Naturhist. Hofmus. Wien, xxvi, p. 337, (1912). 
TRANS. AM. ENT. SOC., XEIII. 
