E. T. CRESSON, JR. 11 



each side of the middle vittii, giving the head a condiform shape at the occiput 

 when seen from above; the outer verticals are situated, eacli, at the extreme 

 point of these productions; the post-verticals are in the concaved portion at the 

 end of the median vitta ; another pair, the inner verticals, are situated before 

 these post-verticals, one each side of the vitta. Occiput likewise produced poste- 

 riprly, polished, dark brown below, lighter beneath the vertical productions. 

 Face pearly black, very short, because of the encroaching of the oral margin 

 betweeti the antennal fovea;; a nose-like carina is distinct between the antennae; 

 a black velvety spot each side of the antennse, with a whitish spot beneath; 

 cheeks linear, yellowish ; clypeus not prominent, brown. Proboscis yellow to 

 brown; palpi black. AntenniP longer than the face, black ; third joint four to 

 six times as long as the second, cylindrical to about two-thirds its length, then 

 suddenly tapering to a blunt apex; arista brown, with long pectinations above. 

 Thorax brownish; mesonotum brown pollinose; one post dorsocentral, one post- 

 alar, one supra-alar, two noto-pleurals. Pleurae more shining, whitish below, 

 more or less yellowish nearer the coxae ; sternopleura with a series of fine, long, 

 brown hairs; metanotum subshining, whitish. Scutellum abruptly produced 

 above, before the two apical bristles, this callus being brown pollinose, the re.st 

 polished. Halteres whitish, knobs black. Abdomen somewhat brown pollinose 

 above, excepting the shining first and last segments; the posterior margins of 

 the first broadly, and the following segments, narrowly, whitish margined. 

 Genitalia similar to Calobatn antenvxpes Say, but the clasps of the male are more 

 flattened, yellow at base, black at the tips where they are abruptly bent inwards, 

 and provided with minute spines on their inner edges. Ovipositor of female 

 polished, black. Anterior legs blackish; middle and posterior legs rufous or 

 yellowish; posterior femora suddenly thickened just beyond the middle, taper- 

 ing to the knees. Wing blackish ; hyaline as follows: base to end of second basal 

 and anal cells, a band over the anterior cross-vein, elongated, a rounded spot in 

 the submarginal cell at end of second vein, another beyond in the closed or 

 nearly closed apical cell, and another beyond the posterior cross-vein ; anal cell 

 short, acute; anterior cross-vein at or beyond the middle of the discal cell. 

 Length 8-9 ram. 



Both .sexes. Piu-ainaribo, Dutch Guiana (Mayo). 



The three elongated spots in the apical portion of the wings are 

 very characteristic of this species, as well as the cordate formation 

 of the occiput. The wing is figured by Macquart, and his figure of 

 the head shows the shape of the vertex very well. 



Cardiacephala niyriinex Schiner, Novara Eeise, 255, 1868. 

 !Male. Paramaribo, Dutch Guiana (^Mayo). 



TRANS. AM. ENT. SOC. XXXIV. JANUARY. 1908. 



