50 
STUDIES OF TETRIGINiE (aCRYDIIN.®) . 
Rostella, gen. nov. 
Vertex strongly produced horizontally, rostrate, the pro¬ 
cess advanced more than twice the length of the eyes, 
middle carinate, lateral carinae compressed, bilobate, and 
towards the apex narrowed but obtuse, the vertex between 
the eyes very wide, more than twice the width of one of 
the eyes; eyes moderately small; frontal costa widely 
sulcate ; paired ocelli placed barely below the middle of 
the eyes ; antennae very short, inserted between the lower 
angles of the eyes. Pronotum smooth, anteriorly obtuse 
angulate, narrow and scarcely dilated between the humeral 
angles, lenthily prolonged backward, the posterior process 
produced beyond the hind femoral apices, subdepressed 
between the shoulders ; humeral angles widely curvate; 
median carina little elevated compressed ; prozonal carinac 
forward widely separated, parallel; posterior angles of the 
lateral lobes turned outwards, angularly dilated; elytra 
moderately small, oblong, apices narrowly rounded ; wings 
fully explicate but not reaching to the apex of pronotal 
process. Anterior femoral margins strongly compressed; 
middle femora more slender-elongate than the anterior, 
margins subundulate; posterior femoral knees bearing 
three apical denticles; first articles of posterior tarsi 
subequal in length to the third. 
This genus resembles Mitritettix , Hancock, but differs 
in the form of the produced process of head; in the higher 
position of the paired ocelli, and place of insertion of the 
antennae; in the obtuse angulate front border of the pro¬ 
notum, and in the slender intermediate tibiae which are 
not at all compressed or sulcate. The type is Acridium 
( Tetrix ) phyllocerum, De Hann, equivalent to Mitraria 
phyllocerum, Bolivar. 
R. processus, Hancock. 
Mitritettix processus, Hancock, Trans. Ent. Soc. Lond. 
p. 229, pi. 21, fig. 8, 1907. 
Numerous examples, Kuching, Matang Rd. Sarawak 
Museum. 
Bolivar applied the name Mitraria to a genus of Tetti- 
gids comprising two species. The first-mentioned species, 
M. producta , Bol., appears in South America, and forms 
the type. The second species, Acridium ( Tetrix ) phylloce¬ 
rum, De Hann, is native of Java. Owing to Bolivar’s name 
Mitraria being preoccupied, I renamed his genus Mitri¬ 
tettix in Genera Insectorum, footnote, p. 51, 1906. In 
