March 1S96.] 



SUPPLEMENT TO PSYCHE. 



23 



rounded incursion of the black. Abdomen 

 witb weak lateral spines on segments 3-6; 

 finely punctured, shining. Broadly inter- 

 rupted yellow bands on segments 1-5, the 

 interruption in each case takes the form of a 

 broad wedge of black, so that the yellow 

 marks come closest together at their distal 

 margins, being thence obliquely truncate; 

 this is most perceptible on the first two seg- 

 ments. 



Hub. — Albuquerque, N. M., June 30, iSgj, 

 between the town and tlie University (Ckll., 



Var. defectus n. var. — Abdominal bands 

 reduced to spots, rounded or not obliquely 

 truncate inwardly. The legs are darker, 

 lighter portions inclining to rufescent in 

 some specimens. Albuquerque (Ckll., 3231, 



3M3. 3=^9. 3-39)- 



O. heterolepis was taken at Albuquerque 

 on June 30 in some numbers, almost surely 

 on flowers of Fallugia faradoxa, though 

 unfortunately no record was kept of this. 

 Most nearly related to fackardii. In this 

 species, however, the spine is not at all nar- 

 rowed towards the tip; the lateral faces of 

 metathorax are very sparsely punctured and 

 the striae strong. It also differs in the shape 

 of the squamae and the puncturing of the 

 abdomen. If, on the examination of larger 

 series, the var. defectus should prove distinct, 

 it can be separated under the varietal name. 



Oxybelus trifidus, n. sp. — Male: About 

 4.5 mm. long, black with dull orange mark- 

 ings, rather finely and closely punctured. 

 Head about as broad as long seen from in 

 front; front comparatively narrow, it and the 

 face covered with silvery pile; vertex closely 

 and roughly punctured; no tubercle. Man- 

 dibles yellow except the tips; terminal half 

 of the flagellum rufescent. Prothorax all 

 black, the margins of the tubercles only, 

 slightly pallid. Mesothorax and scutelluin 

 strongly and coarsely punctured, on the 

 mesothorax posteriorly 'becoming striato- 

 punctate. ScuteHum and postscutcllum each 



with a median carina. Squamae separated 

 by a distance less than their breadth; large, 

 broad, white, semitransparent, with rather 

 strong acute lateral points which are bent 

 under the squamae and about equal their tips. 

 Spine short and very broad, of the emargi'n- 

 alus type, but the emargination filled in bv 

 a broad plate, so that the spine becomes 

 actually trifid, or one might say truncate 

 with two notches. Metathorax above with 

 strong oblique ridges; median area ellipti- 

 cal, scabrous within, passing below into a 

 median carina of moderate length; lateral 

 faces striato-rugose. Tegulae and extreme 

 bases of wings orange rufous. Wings hya- 

 line, nervures brown, marginal cell obliquely 

 truncate. Femora black except the orange- 

 rufous tips beneath. Tibiae and tarsi dull 

 orange-rufous, the middle and hind tibiafe 

 black on the inner side. Abdomen shining 

 black, very closely and finely punctured, 

 short blunt spines on lateral margins of seg- 

 ments 5 and 6 only. Narrow, interrupted 

 orange bands on segments 1-4, those on 3 

 and 4 being linear, and very broadly inter- 

 rupted. Segments 1-2 silvery margined 

 posteriorly. 



Hab — Santa Fe, N. M., Aug. i, 1895 

 (Ckll., 3997). This species is perhaps as 

 nearly related to mexicanus as any. In the 

 form of the spine and some other characters 

 it differs from anv described N. A. species. 



Oxybelus coloradensis Baker. — A speci- 

 men of this species taken at Las Cruces 

 (Ckll., 2436), was determined as einargiii- 

 atiis by Mr. Fox. 



Oxybelus packardii Rob. — One at Albu- 

 querque (Ckll., 4533) . This was on Cleome 

 serruhila, Aug. 15, 1S95. At that date no 

 heterolfpis were found. 



Oxybelus cornutus Rob. — Las Cruces, 

 N. M.. on Solidago canadensis Aug. 24, 1S94 

 (Ckll., 2002) and Albuquerque, N. M., June 

 3<">, 1S95, with hetcfolefis. 



Oxybelus quadrinotatus Say. — Santa Fe, 

 July and .August: variable. 



