CORDYLOBIA 591 



addition two stigmata on the posterior border of the first segment. Duration of the 

 larval stage about eight days. Upon the construction of roads in Guinea the larva 

 is spread by dogs far into the interior. 



Auchmeromyia (Bengalia) depressa (Walker). 1 



Distributed in the region of Natal and apparently over the whole of South 

 Africa. The " larva of Natal," as one may still term the species provisionally, as 

 its identity is not certain, possesses on its head (besides the mouth hooks) lateral 

 protuberances beset with a row of chitinous spines. The cuticle of the body is 

 spinose. The spines are difficult to recognize on account of their transparency and 

 want of colour; they are longest over the anterior segments, from the fifth they 

 become smaller, and over the 

 binder most they are very small. 

 Apart from the foremost segment, 

 the position they take is that 

 of rows running transversely or 

 obliquely, two to four generally 

 in juxtaposition ; the number of 

 spines in the groups gradually 

 increases posteriorly, attaining the 

 number of eight to twelve on the 

 sixth segment, and this number is 

 maintained to the end of the body. 

 Isolated spines are found over the 

 head ; over the second, third and 

 fourth segments single ones are 



still found adjoining the groups of ^ _ He 7d~^d7f larva of Natal." 



spines, from the filth onward they Magnified. (After Gedoelst.) 



are wanting. From here the spines 



cover the whole free surface of the segments ; over the fourth the anterior three- 

 quarters, over the third two-thirds and over the first and second only the anterior 

 half. The stigmata found at the anterior end also serve as distinguishing characters. 

 The parasitic stage appears to last about fourteen days. [Fuller (Agric. Journ., 

 Dept. Agric. and Mines, Natal, 1901, iv, p. 606) refers to this as Bengalia depressa 

 also. F. V. T.] 



Genus. Cordylobia, Grunberg, 1903. 

 Cordylobia grunbergi, Donitz. 



Syn. : Ochromyia antJiropophaga, Grunberg, nee Blanch. ; Cordylobia 



anthropophaga, Grunberg. 



Endemic in German East Africa and neighbouring regions. Larva up to 

 14 mm. long, 4 to 5-5 mm. wide, of cylindrical shape, slightly narrowed behind, 

 truncated, gradually tapering in front ; antennae-like processes, cone-shaped, blunt. 



to eleventh segments thickly covered with minute recurved spines of brownish chitin, usually 

 arranged in transverse series of groups of two or more, which can be seen to form more or less 

 distinct undulating and irregular transverse rows. In each of the two posterior sligmatic 

 plates, the respiratory slit on either side of the median one is characteristically curved, 

 resembling an inverted note of interrogation. The barrel-shaped puparium is on an average 

 IO'3 by 4*6 mm. ; its colour varies from ferruginous to nearly black. F. V. T.] 



1 [According to Austen this is Cordylobia anthropophaga, Griinb. Bengalia depressa, 

 Walker, is a very different insect, whose life-history is unknown. F. V. T.] 



