NO. 2146. SOME AMERICAN FOSSIL INSECTS— COCKERELL 



103 



the type of that species apparently distinct, the thorax being much 

 more strongly transversely grooved, the first discoidal cell longer in 

 proportion to its height, and various other details of the venation 

 different. The following comparative measurements in microns will 

 bring out the differences {s.—secundus ; h.=bradleyi) : First sub- 

 marginal cell on basal nervure, s. T20, b. 672; first s. m. on marginal, 

 s. 480, b. 576; first s. m. on second s. m., s. 1152, b. 1280; first discoidal 

 cell on basal nervure, s. 180, b. 608 ; first discoidal on third discoidal, 

 s. 720, b. 800 ; apical side of third discoidal, s. 720, b. 736. 



Miocene shales of Florissant, station 14 (University of Colorado 

 Expedition). 



Holoiype.—Csit. No. 61458, U.S.N.M. 



I have been a little in doubt whether to consider this a distinct 

 species or only a variety, but it seems to be sufficiently distinct. The 



'a b' 



Fig. 9. — AuLACiTEs secuxdus. a. Anterior wing, h. Anterior part of thorax. 



remoteness of the basal nervure from the stigma suggests affinity with 

 Pristaulacus and Interaulacus. rather than with Aulacinus. The 

 claws can not be seen. 



HEMICHROA EOPHILA, Cockerell (Tenthredinidae). 



A new specimen is 10 mm. long; anterior wing 7.3 mm.; width of 

 thorax very little over 2 nun. The following measurements of the 

 anterior wing, in microns, show some variation from the original 

 type, but do not appear to indicate a distinct species : 



Transverse-costal nervure basad of upper end of basal, about 320 



Length of basal nervure (of which 800 is beyond the bend) 960 



Length of first submarginal cell 3G8 



Length of (oblique) outer side of third submarginal cell 690 



Upper side of third submarginal cell 912 



Third submarginal on first marginal 560 



Lower side of third submarginal 1, 150 



Length of second transverso-cubital 336 



Upper side of second discoidal 850 



Lower end of basal nervure basad of transverso-medial 770 



Upper side of third discoidal 880 



Third discoidal on first discoidal 592 



Third discoidal on second discoidal 480 



Lower side of third discoidal 1,250 



Outer (apical) side of third discoidal 800 



End of second recurrent nervure basad of second transverso-cubital 160 



