INSECTS FROM MIOCENE OF FLORISSANT, COLORADO 723 



known by the different termination of the second vein, and many 

 other details. From Lithocosmus it is known especially by the 

 first posterior cell being without apical con- 

 traction. In Verrall's table of Lomatiinae it 

 runs closest to Prorachthes. The praefurca of 

 Alomatia ends at least 240 // basad of basal 

 corner of discal cell, which is contrary to yf; 



Verrall's diagnosis of Lomatiinae, but his own '^^' 



figure of Lomatia lateralis shows a similar con- 

 dition. The antennae of Alomatia are curiously 

 like those of Thereva. 



Fig. 9. — -Alomatia 

 Protolomatia n.g. (Bombyliidae) f^^^^a, antenna. 



A genus of Lomatiinae, related to Lomatia, 



to which it runs in Verrall's table of Lomatiinae. It differs in the 



long, parallel-sided abdomen, and the much less oblique anterior 



cross-vein. Among the fossil genera it is nearest to Megacosmus, 



the species of which are much larger, with broader abdomen, and 



have the end of the second vein curved strongly backward (not 



far from vertical in the new genus), 



and the side of the second basal 



cell on discal very long. 



j5,jc. Protolomatia antiqua n.sp. 



Length about 9 mm.; wing 

 6f mm.; body dark, slender; 

 abdomen parallel-sided, its width 



Fig. ^o.-Protolomatia antiqua, ^^ m^- antennae slender, about 

 apex of discal ceU. I200 jLt long; thorax and abdomen 



without evident hair. Wings 

 hyaline, faintly dusky; venation nearly as in Lomatia lateralis, 

 but praefurca longer, anterior cross-vein much less oblique 

 (about as in Megacosmus secundus) , upper apical side of second 

 basal cell shorter. 



The following measurements are in microns: 



Length of praefurca 512 



First posterior cell on first submarginal i)25o 



First posterior cell on second submarginal i>iSO 



