ANTOCHA. 125 



auxiliary and first longitudinal veins is peculiar ; the former is 

 closely approximated to the latter and therefore rather indistinct ; 

 the latter, instead of running parallel to the costa and then 

 turning suddenly towards it (as it usually does), gradually merges 

 into the costa, which is incrassated beyond their junction. 1 The 

 marginal cross-vein is feebly marked, although perceptible. The 

 origin of the second longitudinal vein is like that of Erioptera, 

 that is, before the middle of the length of the wing and at a very 

 acute angle ; the praefurca is perfectly straight and quite as long 

 as the remainder of the second vein, or longer ; the submarginal 

 cell is by one half longer than the first posterior ; the latter is 

 square at its inner end, the small cross-vein being comparatively 

 long ; discal cell small, almost square ; its inner end is oblique, 

 arcuated ; owing to the shortness of the first posterior cell, the 

 discal cell is unusually near the tip of the wing ; the three last 

 longitudinal veins are nearly straight. The stigma is elongated, 

 its outline rather indefinite. 



The wings of the species described below have a peculiar 

 milky-whitish tinge ; they are distinctly iridescent, when held 

 obliquely towards the light. Besides, they show another peculi- 

 arity : it requires a magnifying power of 150 to discover the 

 microscopic pubescence on their surface ; so magnified, they 

 appear covered with black dots, emitting very short hairs (much 

 less power is required to show the pubescence on the wings of 

 most of the other Tipulidse). The forceps of the male (Tab. Ill, 

 fig. 10) has, on the usual basal pieces, a double claw-shaped 

 appendage, which, as well as I could perceive, consists of a horny 

 and of a soft part, closely joined. The ovipositor is of moderate 

 length, somewhat arcuated. 



The peculiar venation and the milky white 'tinge of the wings, 

 the shape of the anal angle, etc., render this genus easy of recog- 



' In order to ascertain this peculiarity of the venation with more pre- 

 cision, I compressed a wing of A, saxicola between two glass plates. This 

 straightens the fold usually existing in the Limnobia between the costal 

 and first longitudinal veins and shows the course of the auxiliary vein 

 with greater distinctness ; in this case this vein appeared separated from 

 the first longitudinal by a narrow interval for about one-third of its length 

 only ; beyond that both veins ran close along side of each other, till both 

 united with the costa. Under such circumstances there was evidently no 

 room for a subcostal cross-vein. 



