TABANUS. 51 



excised above, the upper corner drawn out in a point which reaches about half the 

 distance to the annulate portion ; front comparatively narrow, narrower in front than 

 behind ; a denuded, slightly convex frontal line expands but very little in front into a 

 narrow callus, posteriorly it stops long before reaching the vertex ; on the latter a 

 small denuded space bears the vestiges of ocelli (imperceptible in some specimens); 

 subcallus flat, opaque, brownish. The uniformly black colour of the whole body is 

 varied only by a slight whitish efflorescence on some parts of the front, on the thorax, 

 and the abdomen. The pleurae are deep black, with long black hair ; the abdomen is 

 fringed all round with black hair ; the hind tibiae have the usual fringe of black hair, 

 but it is less apparent than in T. atratus on account of the other hairs which clothe 

 the tibiae being longer than in T. atratus. Wings of a uniform blackish-brown ; some 

 specimens show subhyaline spots in the marginal and submarginal cells ; the bifurcation 

 of the third vein opposite the tip of the second of the veins issuing from the discal cell ; 

 first posterior cell broadly open, although a little narrower at the tip than in the middle. 

 Tegulae black or dark brown, and, for this reason, their darker fringe but little perceptible. 

 Six females ; two of them have the wings more brown than black. 



6. Tabanus corone, sp. n., $ . 



Altogether black, including the wings ; knob of the halteres whitish-yellow ; first posterior cell broadly open; 



subcallus convex, shining ; upper corner of the third antennal joint rectangular, not drawn out. 

 Length 17-18 millim. 



Eab. Guatemala, Panima {Champion). 



At first sight this species (of which we have only a single female) might be taken for 

 a small specimen of T. erebus ; it will be easily distinguished, however, by the shape of 

 the third joint of the antennae, which has but a shallow excision above, and the upper 

 corner of which is rectangular and not drawn out in a long point. The proboscis is 

 shorter ; the palpi are shorter, stouter, more curved at the base, more shining ; the 

 front is parallel, not perceptibly narrower in front ; there is a frontal elevated line, but 

 it does not expand into a frontal callus ; the subcallus is convex, shining. The colour 

 is uniformly black, with a white efflorescence on the front, thorax, and abdomen ; the 

 thoracic dorsum and scutellum show traces of reddish, due perhaps to immaturity ; 

 tegulae whitish, and, for that reason, their black edges more visible. 



I deem it useful to give here a synoptical table of the five species of Tabanus with an 

 altogether black body and black wings which occur north of the Isthmus of Panama. 



Halteres with a yellowish-white knob. 



Upper angle of the third joint of the antennae drawn out in a long 



point ; subcallus flat, opaque erebus, O. S. 



Upper angle of the third joint rectangular, not drawn out ; subcallus 



convex, shining corone, O. S. 



k2 



