178 CHARLES W. LENG. 



" crevices. When flying in the sunshine its crimson and nearly 

 "transparent abdomen appear like a drop of blood suspended to its 

 " tail. 



Color almost black, the two dots of the humeral lunule sometimes 

 connected at the margin ; the middle band reaches the margin and 

 is dilated into a short marginal line which extends forward; the 

 supplementary marginal spot is sometimes connected also with this 

 line; the under surface is blue and green. 



Vht. 16-puiicfala Klug, 1834, Jahrbuch fiir Insectenkuude, p.32; Lee, /. c, p. 

 56; Sehaupp. I.e.. p. 106, pi. 4, fig. 111. 

 Lengtli 10-13 mm.=.40-.52 inch. 



Habitat. — Western Texas, N. Mex., Ariz. Recently collected by 

 Prof. Wickham on the shores of the Rio Grande at Albuquerque, 

 N. Mex., flying about nmddy flats. Very similar to the preceding ; 

 the middle band does not extend to the margin and is frequently 

 separated into two dots, so that each elytron has eight dots. 



V'ar. arizonse Wickham, 1899, Pioc. Davenport Acad, of Nat. Sci., vii, p. 226. 

 Length 11 mm. =.44 inch. 



Habitat. — Canou of the Colorado River, in Arizona. July. Col- 

 lected by Prof. Townsend on sandy places or along paths by a stream 

 going down a side canon from Hance's Stone Cabin (2500 feet above 

 the river and 2500 feet below the rim) to the level of the Colorado 

 River. 



Reddish bronze above, with greenish reflections, bronzed beneath, 

 with the same reflections, trochanters and abdomen rufous, legs 

 cupreous; elytral markings consist of complete humeral lunule, 

 middle band not or very slightly extended on the margin, obliquely 

 bent, not much narrowed at any part ; supplementary dot small, 

 and apical lunule entire. More hairy beneath than any other 

 variety. 



Marginipennis group. 



Abdomen red ; palpi pale; head not hairy ; very finely striate all ovei' the upper 

 surface; elytra conjointly rounded in both sexes; surface sericeous; a 

 fringe of hair on each side of the thorax above ; sparsely hairy beneath ; 

 elytral markings a marginal line with branches indicating the lunule. 



Labrum short, elytra not foveate niarginipenuis. 



Labrum longer, elytra with green fovese Mcliauppii. 



€. marginipennis Dej., 1831,Spec., v.260; Laf.Kev. ZooL, 1841, p. 193; Lee. 

 Ann. Lye, iv. 182, pi. 14, fig. 11; Trans. Am. Phil. Soc, xi, p. 57; 

 Sehaupp, I.e., p. 107, pi. 4, fig. 107. 

 Length 11-14 mm.^.44-.56 inch. 



