Mr. F.. P. Pascoe on new Curculionide. A451 
its most striking forms *; the rostrum varies considerably in 
length, as is often the case in parts which pass beyond the 
normal condition of the typical form. The relative length of 
the funicular joints is also variable in this and other species, 
according to sex. The minute setule on the upper surface 
are bifid almost to the base; those on the body beneath are 
apparently simple, but are crowded four or five together, so as 
to appear under an ordinary lens as one scale. 
Menemachus stigma. (Pl. XVIII. fig. 4.) 
M. anguste obovatus, piceus, griseo-pilosus ; elytris in medio macula 
nivea notatis ; tibiis anticis valde arcuatis, canaliculatis. Long. 2 
lin. 
Hab. Angola. 
Narrowly obovate, pitchy, covered with greyish hairs ; 
elytra in the middle with a snowy white squarish spot, and 
another, but less conspicuous, near the apex; rostrum shorter 
than the prothorax, compressed at the base; head with a 
sharply elevated line between the eyes; antenne ferruginous ; 
prothorax closely punctured; scutellum punctiform; elytra 
scarcely broader than the base of the prothorax, narrowly 
striate-punctate, punctures linear, inconspicuous; interstices 
broad, flat ; beneath with greyish setule ; anterior tibiee much 
curved, canaliculate, the inner edge ciliated. 
The type of Menemachus is a rare South-African insect 
which I have not seen, and which appears to differ specifi- 
cally from the above in the absence of the central spot and 
the squamulose, not setulose, vesture. Boheman (in Schén- 
herr, vii. pt. 2, pp. 267, 268) says nothing of the compressed 
base of the rostrum and the sharp ridge extending to between 
the eyes. 
ARYPTAUS. 
Characteres ut in Mecocoryno; sed clava antennarum ovata; meso- 
sternum depressum, haud cornutum ; et femora postica abdomen 
haud superant. 
Owing to the shortness of the posterior femora, this genus 
* Asin many other large genera, the species of Alcides vary greatly in 
appearance ; but the technical characters of the genus are fairly constant 
throughout. An exception, however, must be made with respect to A. 
frontalis (Pascoe, Journ. Linn. Soc. xi. p. 183), which, with a six-jointed 
funicle and a bisinuate prothorax, has the anterior coxz contiguous, and 
a stout rostrum almost continuous at the sides with the head. I propose 
for this species the generic name of Acerus. All the species of Alcides 
areeither West and South African or Indo-Malayan, with two or three from 
Central Asia, The Australian A, heilpordes is an Orthorhinus. 
30* 
