1914.] NATURAL SCIENCES OF PHILADELPHIA. 643 



DIPTERA. 



Protolomatia antiqua Cockerell (Bombyliidae). 



The reverse of the type has been found antl shows some of the 

 details of the venation better than the original specimen. It shows, 

 in particular, that the upper basal corner of second submarginal cell 

 has a short accessory nervure pointing directly basad; consequently, 

 in my table in Bull. Amer. Mus. Nat. Hist., XXXIII, p. 233, the genus 

 runs straight to Alepidophora. The insect is, however, very distinct 

 from Alepidophora pealei in a variety of ways, such as the more 

 widely open first posterior cell, the quite different shape of the second 

 posterior, and the shape of the end of the marginal cell. The end 

 of the marginal cell in A. pealei is like that of Paracosmus morrisoni, 

 whereas in P. antiqua it is as in Paracosmus insolens. In the original 

 account of A. pealei, it appears that the prsefurca is practically obso- 

 lete, but a new study of the type shows that this is an error of inter- 

 pretation, owing to the condition of preservation; the prsefurca is 

 actually 880 microns long in A. pealei, while the first basal cell on 

 the first submarginal is 2,240 microns. 



In the reverse of P. antiqua the abdomen appears reddish, con- 

 spicuously lighter than the thorax; it is not banded like that of 

 A. pealei. 



A new and much more complete set of measurements (in microns) 

 of P. antiqua is offered. Length of prsefurca, 592; width (depth) 

 of marginal cell near end, 480; first submarginal on wing margin 

 (not allowing for curve), 850; squared basal end of second submargi- 

 nal, 272; second submarginal on first posterior, 1,184; first basal 

 on first submarginal, 1,472; first posterior on first submarginal, 

 1,280; length of anterior cross-vein, 288; discal cell on first basal, 

 1,360; discal on first posterior, 608; width (depth) of discal cell at 

 level of anterior cross-vein, 304; discal cell on second basal, 224; 

 first posterior on wing-margin, 304; second posterior on discal, 280; 

 second posterior on wing-margin, 800; second posterior on third, 

 992; third posterior on wing-margin, 720; fourth posterior on second 

 basal, 128; greatest width of anal cell, 352; anal on wing-margin, 

 400. 



Geron C?) platysoma n. sp. (Bombyliidae). 



Length about 10.5 mm.; thorax about 3 mm., the dorsum in 

 lateral profile flat for about 2 mm. ; length of wing, 7.5 mm. ; abdomen 

 with dorsal region alternately banded dark and light, the dark twice 

 as broad as the light (as Becker figures for Heterotropus glaucus). 



