




Acridoidea from Madagascar, Comoro Islands and Eastern Africa. 625 
sently tectate, rather slender, extending beyond the tip of abdomen and apex of hind femora, without well 
defined shoulders, the median and lateral carinae moderately strong, the posterior lateral angles turned 
outward and excised so as to form a prominent curved anteriorly directed spine or tooth. Abdomen com- 
pressed, quite deep, tapering very perceptibly near the apex, the subanal plate long and slender, its tip 
deeply and broadly notched. Anterior and middle femora slender, their superior carina well defined or 
prominent, but straight; hind femora robust at base but slender at apex, a trifle surpassing the tip of the 
abdomen; hind tarsi with the first joint perceptibly longer than the third, containing but two pulvilli the 
second of which is twice the length of the first. Entirely without tegmina and wings. 
Length of body, d, 12 mm, of pronotum, 13 mm, of hind femora, 7 mm, of entire insect, 14,5 mm, 
of fastigium of vertex, 1,2 mm. 
A single male, Sakana (O. Madagaskar), Urwald, September 1904. Voeltzkow. 
Tetrix nanus n. sp. 
Small, the pronotum and wings abbreviated, the former just (d) or not quite (9) reaching the apex 
of the abdomen, the wings two-thirds to three fourths the length of the abdomen. General color dull 
fuscous, paler beneath, the tibiae and tarsi annulated with flavous and fuscous; antennae heavy, flavous, 
and with the apical two or three joints infuscated. 
Vertex about as wide as one of the rather prominent eyes, angulate and well advanced in front 
of the eyes; top of the head depressed and widely sulcate between the coarse and prominent median carina 
and the eyes, the carina continuous with the frontal costa with which it unites at an angle; frontal costa 
prominent, rather broadly and deeply sulcate nearly to the apex, the sides almost parallel; lateral carinae 
of vertex prominent, abruptly bent back at front edge of and continuing a little inwards to the middle of 
upper edge of the eyes; antennae inserted just within the lower edges of the eyes. Pronotum slightly 
tectate between the shoulders and anteriorly provided with a prominent median carina which is also gently 
arcuate in advance of the humerae, lateral carinae prominent, but to a much less degree than the median, 
all of the carinae „beaded“ or finely crenulate, the surface of the body, head, limbs and pronotum sharply 
granulose; anterior edge of pronotum at middle gently angulate. Tegmina small, oblong-ovate, the apex 
gently acuminate. Legs only moderately robust, the anterior and middle femora with the carinae strong 
but neither undulate or clypeate; hind femora provided on the outer disk with four or five elongate, oblique, 
strong rugae and on the upper edge with about a dozen evenly distributed shorter ones. 
Length of body, d, 6,25 mm, 9, 9,4 mm; of pronotum, d, 5,5 mm, 9, 7 mm; of hind femora, d, 
4,35 mm, 9, 5 mm. » 
Habitat. Fenerive (O. Madagaskar), July 1904. Voeltzkow. 
This is a beautiful little inseet, and quite distinet from all other species on account of its small 
size and uniform coloration. A larger series may show some variation in this latter respect, since the 9 
specimen has dim dusky markings on either side of the disk back of the humerae. 
Tetrix sp.? 
There is also a single 9 specimen of what appears to be another species of the genus Tetrix and 
quite closely related to the preceding. It is somewhat larger and a trifle more robust than 7. nanus, and 
in color pale cinereo-testaceous marked on the disk of the pronotum above by two prominent lunate black 
spots on each side of the high and evenly arched median carina. The inseet bears the labels Chake- 
Chake, Insel Pemba (British O. Afrika), 10. April 1903, Streifsack. Voeltzkow. 
Voeltzkow: Reise in Ostafrika 1903—1905. Wissensch. Ergebnisse, Bd. II. 79 
