182 (lb. à. c. oudbmans) notes on acabi. 



There is still very little clearness in the development of the species 

 of the genus Belba Von Heyd. 



I am now able to give descriptions and figures of the larva and 

 nympha of Belba geniculata Linn, {iion Koch, non Nicolet). 



Larva, (fig. 16). Its length is 0.471 , its breadth 0.1 , and its 

 height 0.216 millimeters. Its colour is a uniform pale yellow 

 (« lausfarbig » as the Germans say). The skin in very finely gran- 

 ulated. The six legs are slender ; the coxae are the smallest articles , 

 those of the hind-feet are double in length as those of the two 

 fore-feet. The femores, genuals, tibiae are approximately cylin- 

 drical , whilst the tarsi are tapering to their distal end , and bear 

 a movable claw. 



The pseudostigma is perfectly round; its pseudostigmatic organ 

 long, nearly filiform, somewhat thickened in the middle; it meas- 

 ures 0,135 millimeters; its most striking peculiarity is tliat it is 

 provided for a great part with somewhat transparent globular ap- 

 pendages like dew-drops, which gave to the whole the aspect as 

 if dust were adhering to it. But as all the other hairs and the body 

 itself were quite free from dust sticking to it , the idea of dust 

 must at once be abandoned (fig. 18). 



One single very small and smooth hair is planted on the belly. 

 Each of the chelicerae (mandibels) bears a little hair (fig. 17) on 

 its dorsal surface. The tactile part of the maxillipedes (the palpi) 

 consists of 4 articles with some few little hairs. On the dorsal 

 surface of the thorax, that part of the body which bears the legs , 

 and which in our larva is distinctly sepaiated from the abdomen 

 by a tolerably deep furrow, there are four pairs of long hairs. 

 The foremost pair is situated nearly in the line of the insertion 

 of the maxillipedes and is directed forward as if with tactile func- 

 tions. The three other pairs are situated far more backwards and 

 all behind the line of the pseudostigmae ; they are longer and 

 directed upwards and somewhat curved hindwards. The very ab- 

 domen shows five pairs of hairs, whose lengths, curvature, and 

 position is clearly shown in the figure (fig. 16) which represents 

 the animal seen from its right side. All these hairs are planted 



