8 HYMENOPTERA OF AMERICA. [PART i. 



This fine insect was discovered by W. J. Howard, and described 

 by E. T. Cresson. Numerous individuals were taken by Ridings 

 in Colorado Territory on a plant allied to Lobelia. 



2. JI. zoualis Cbbsb. — Nigra, fusco-liirta ; anteimarum articulis 4, 5 



breribus; clypeo arcuatim emargiuato; thorace parum ilepresso; 



Miitello carinato ; metanoto utrinque canthum compressnui longe spi- 



' iioMuii efficients; corpore valde sulfureo-variegato ; abdoiuine fasciis 



uompletis 5 ; auo bimaculato; alis subferrugineis. 9- 



.1/. zonalis Ckesson, Proc. Ent. Soc. Philad. Ill, 1864, 674, 2. <? . £ . 

 J. Total length 15 mill. ; wing 8-9 mm. 



J. Clypeus notched in arc of circle, convex, finely punctured. 

 Labrura triangular, rounded at tip, pubescent, with fulvous 

 hairs. The whole insect very finely sculptured. Thorax but 

 little depressed. Metathoras flattened behind, but not depressed ; 

 the angles compressed into strong carina;, armed on each side 

 with a long spine, as in M. vespoides. 



Black, with brown hairs. Antennas fulvous; scape black, with 

 a yellow spol ; 2d joint black; 3d yellow; those following very 

 short; the did) blackish above. .Mandibles, a spot in the fore- 

 head, the whole orbits, the hind margin of prothorax, and (partly 

 or completely) the fore margin, a spot under the wing, tegulae, 

 post tegulae, margin of scutellum and the angles of metathorax, 

 sulphur-yellow. A complete and regular submarginal fascia on 

 all the segments of the abdomen ; beneath, only lines of macula? ; 

 6th segraeul above, with two yellow spots. Feet black at base, 

 yellow from the knees to the end. Wings as in the preceding, 

 with ferruginous veins; radial cell rather brown; 1st recurrent 

 vein inserted nearly at the inner angle; the 2d about in the 

 middle of the 2d cubital cell. 



Var. A yellow spot on the clypeus ; 2 spots on the forehead; 

 antennas more black; a yellowish tip on the coxae. Fascia; of 

 the abdomen a little emarginated; the band of the 6th complete. 

 A larger subquadrate spot beneath the insertion of the 

 antennae, and the clypeus and labrum pale yellowish- white. 

 clypeus shaped like that of if. vespoides %, but more flattened 

 and less deeply emargin ate al tip; antennae rather longer than 

 head and thorax, proportioned as in Vespoides %, except that 

 the club is not at all flattened beneath ; the joints pale yellowish- 



