WERNER MARCHAND 173 



manus. The dorsolateral comb consists of a few short and rather 

 stout spines. 



Figures are given of the syphon of the larva (Plate 5, Fig. 70), the 

 pupa (Plate 12, Fig. 138), pupal aster, and dorsolateral comb of both 

 sexes (Plate 14, Fig. 176, a-d). 



Tabanus virgo Wiedemann. — ^A small species, recorded for Bengal 

 and South India. On its early stages we possess notes through the 

 work of Patton and Cragg. 



As in all the small tabanids observed by these authors, the eggs are 

 laid on blades of grass just at the edge of a shallow stream, or on the 

 leaves of the lotus plant at the edges of small ponds, but never over 

 deep water. The larvae, as in the other small species, are said to 

 have no air sacs, and to die when falling into deep water. 



The mature larva of Tabanus virgo is figured by the same authors 

 (Plate 4, Fig. 63). Attention is called to the openings of the tracheae 

 being flush with the body. In fact the syphon is extremely short 

 when compared with that of Tabanus hicaUosus, while as shown in the 

 figures, in Tabanus ditcBniatus it is of medium length. On the figure 

 given, the larva of Tabanus virgo shows no striation or color pattern, 

 but the mouth-parts appear larger than in the other species, and the 

 prolegs are large, fleshy, and somewhat modified. 



A small egg mass of this species is figured (Plate 1, Fig. 16) as laid 

 on a dry twig, and consisting of only five eggs, attached to a twig 

 which in fact is much smaller in diameter than the eggs themselves. 



The pupa is figured (Plate 11, Fig. 134) by Patton and Cragg, and 

 in addition, an enlarged figure of the eighth abdominal segment of 

 the pupa is given (Plate 12, Fig. 146), showing the six terminal teeth 

 and their arrangement. 



Tabanus vivax Osten Sacken. — A North American species which 

 apparently is never very plentiful, but has been taken in a number 

 of the eastern states (New York, Maine, Ohio, etc.). In Ohio it is on 

 the wing during the last half of June. 



The life history has been worked out by Hine. The eggs are de- 

 posited in masses composed of several hundreds, on stones that pro- 

 ject above the water in riffles of streams. The egg mass is nearly 

 round in outline, only slightly convex, composed of about three 



