1940] 
Ichneumonid Genus Acerataspis 
121 
A SYNOPSIS OF THE GENUS ACERATASPIS 
(HYMENOPTERA, ICHNEUJHONID^E) 
By Charles D. Michener 
University of California, Berkeley 
The genus Acerataspis was originally described from Jap- 
an. A second species has been found in Formosa, and in this 
paper a third is described from southern China. A rede- 
scription of the genus is here given, since the original charac- 
terization proves to be inadequate in the light of the spe- 
cies discovered since its publication. 
Acerataspis Uchida 
Acerataspis Uchida, 1934, Ins. Matsumurana, 9 : 23 
Cushman, 1937, Arb. u. morph, u. tax. Ent. 
Berlin-Dahlem, 4 : 290 
Cerataspis Uchida (nec Gray), 1934, Trans. Sapporo Nat. 
Hist. Soc., 13 : 275 
Moderate sized, coarsely punctate, black, with yellow fa- 
cial markings and abdominal fasciae. Read not broader than 
thorax ; face longer than broad, evenly convex below the an- 
tennae, without a facial shield; epistomal suture absent; 
antennal sockets close together, separated by a strong longi- 
tudinal keel, the lower end of which is continuous with the 
elevated, convex, lower part of the face ; mandibles bidentate 
at apices ; hypostomal carinae not very high ; no palpal seg- 
ments swollen as in Metopius; eyes seen from the side 
broadest below the middle (at least in sinensis). Thorax 
short and high ; sides of pronotum shining and impunctate, 
with longitudinal grooves; mesoscutum without parapsidal 
furrows; mesoscutellum with a basal, median, impunctate, 
longitudinally carinate, transverse, depressed area, behind 
which is an elevated area, the sides of which are margined, 
and the posterior lateral angles of which are produced pos- 
teriorly, as in Metopius. Propodeum short, its spiracles 
