E. T. CRESSON, JR. 283 



The markings of the wings brings tliis species near A. trifasciuta 

 Wied. (according to description), but its l)lack scntellnni, gray 

 abdomen and black legs will I'eadily characterize it. 



The markings of tlie wings alone will separate it from ^4. aiito- 

 mara AVied. The figure of the wing of A. automara Wied. in the 

 Biol. Cent.-Amer. shows the third vein very sinuate at the apex. 

 This species has no indication of such. 



This genus, as Loew states, " is not very well placed in the family 

 Ortalidjfi," but disregarding the presence of the unusual preapical 

 bristles, it will fall in the subfamily Ortalinse. 



Ptvrocalla uiidiilata sp. nov. (PI. VI, fig. 6). 



In general, entirely grey-ochreous, pollinose, dotted and striped witli coffee- 

 brown. 



Head more yellowish. Front with minute black bristles, excepting on the 

 frontal lunule; the oeellar region brownish ; one pair frontals besides the usual 

 vertical bristles. Cheeks with numerous black bristles on the posterior portion 

 adjoining the occiput; the occiput more whitish ; the upper portion of the poste- 

 rior orbits brownish. Antennie reddish, the third joint about twice as long as 

 wide; the arista twice as long as third joint, black. Eyes black. Palpi brown 

 at tip. Proboscis black. 



Thorax dotted with brown on the dorsum, and bearing one pair acrosticals and 

 two pair dorso-central bristles; the pleurte irregularly striped longitudinally. 

 Scutellum convexed, dotted, with four bristles. Squamula blackish. Halteres 

 whitish. 



Abdomen same color as the thorax, having a transverse row of spots on the 

 dorsum of first to third segments; the posterior margins of all segments with an 

 irregular brown border interrupted in the middle; the medium portion esi)e- 

 cially and somewhat all the dorsum of all but the first segment minutely spotted. 



Legs in general yellow; fore and hind femora somewhat brownish ; two indis- 

 tinct bands on the hind tibia; all tarsi light yellow. 



Wings rather broader than usual, very obtusely rounded at apex; in general 

 brown, darker at base; the posterior margin clearly hyaline only below the fifth 

 vein, and but slightly so in the second posterior cell ; two small hyaline indenta- 

 tions on the anterior margin, at the ends of the auxiliary and first veins; a sin- 

 gle series of semi-hyaline spots in the first basal cell ; an indistinct hyaline spot 

 between two wrinkles in the apical portion of marginal cell opposite the end of 

 first vein ; two brown spots beyond the one eye-spot of the subraarginal cell ; two 

 eye-spots in the first posterior cell. The second especially and the fourth veins 

 very sinuate at their apical portion, the third not so much. The anal cell with 

 a very long lobe. A very clear hyaline spot in the second posterior cell is some- 

 times confluent with the hyaline margin. The small cross-vein is colorless in 

 the middle. Length 6 mm. 



Guadalajara, Mex. One % . Type, coll. Acad. Nat. Sci. Phila. 

 This species approaches P. costalis v. d. W., but the even coloring 



TBANS. .\M. ENT. SOC. XXXII. OCTOBER, 190(J. 



