238 ERNEST A. BACK. 



I have a male Ceraturgns also from Dallas, Texas, belonging 

 to the M. C. Z., which is about 13 mm. in length and very 

 closely resembles the male of cruciatus. The two basal seg- 

 ments of the antennas are reddish (remaining segments of an- 

 tennae gone) ; there is a fine golden line on the posterior margin 

 of the first abdominal segment, and pale golden spot on the 

 posterior lateral angles of the second and third segments. 

 The coxae and trochanters are black, the femora chestnut, the 

 tibiae and tarsi yellowish. Basal portion of the wings are 

 blackish; the outer portion nearly hyaline. The pleurae are 

 not wholly golden or grayish pruinose, but more as in cru- 

 ciatus. 



Ceraturgus nigripes. 



Ceraturgus nigripes Williston, Trans. Am. Ent. Soc, XIII, 287, 

 1886. 

 " cf . — Length 14 mm. — Abdomen with golden pruinose posterior 

 cross-bands; legs black. Antennae in structure like those of C. cru- 

 ciatus, the style somewhat shorter, black; the first segment brushy 

 black hairy, the second segment less so. Face projecting a little more 

 below than in C. cruciatus; densely light golden pruinose, and with 

 long, soft, rather abundant light yellow pile below, extending up more 

 thinly in the middle; occiput below with white hair; above, the 

 occipito-orbital hairs are black, longer and more abundant than in 

 C. cruciatus; front polished black, with black hair except some yellowish 

 ones on the ocellar tubercle, the orbits narrowly golden pruinose. 

 Dorsum of thorax thickly golden pruinose, leaving two not very broad 

 median brownish-black stripes, separated by a line, and on each side 

 two large, oval, black spots narrowly separated by a sutural line; 

 pile or hair rather long and erect, on the front part yellowish- white, 

 broadly behind black, the bristly hairs of the posterior callosities and 

 the scutellum light yellow; pleurae thickly light yellow pruinose, below 

 and on the coxae more grayish. Abdomen in shape like that of C . 

 cruciatus, with short, but abundant, erect, light yellow pile; each seg- 

 ment with an opaque light golden yellow posterior cross-band, com- 

 posed of dense bloom, moderately narrowed on the sides; that on 

 the first segment narrowest, that on the second comprising about one- 

 half the segment, on the last leaving only a slender anterior black 

 band. Legs pitchy black, the tibiae and tarsi fulvous pubescent; the 

 pile of the coxae, especially the fore ones, and of the femora below, 

 long and silky white. Wings pure hyaline; neuration as in C. crucia- 

 tus.'' 



The female, which I have seen, agrees with the description. 



