ZETHUS. 41 



gray hair ; its inferior margin carrying in the middle a very small 

 notch, above which is a little yellow. Antennas a little tawny at 

 the extremity, terminated by a hook and by a slight rolling up. 

 Metathorax spotted with yellow ; anterior border of prothorax 

 often black. 



Var. a. Clypcus and scutel black; no spot under the wing. 



b. At bottom of metathorax two yellow spots. 



c. A yellow line in front of the mandibles. 



Bess. a. diff. — This species is recognizable by the particular 

 form of its abdomen. The lengthened petiole, longitudinally 

 linear, becomes suddenly campanular; the second segment gradu- 

 ally swelled, so that the abdomen is pyriform rather than globular- 

 ovate. The lengthening of the thorax and the head a little en- 

 larged, recall the forms of the Eamenes} The metathorax, also, 

 presents no concavity; the position of the furrow is, however, 

 indicated, and it is rugose and striate, but is convex in place of 

 being excavated. 



This insect appears to be allied to Z. discaelioides. 



Hob. The temperate regions of Mexico. I have taken it in the 

 valleys of Cordova, of Orizaba, and of Mextitlan (four females, 

 five males). 



I possess one specimen, a ?, as small as the % , and which is a 

 little more strongly punctured, which has the petiole shorter in 

 the linear part, and is sensibly more coarsely punctured in its 

 enlarged part, The scutellum and post-scutel each have two 

 yellow spots. Length, 0.010; wings, 0.008. 



Is this a variety of Z. Montezuma, or a species ? I have taken 

 it on the banks of the Rio Panuco, in the Huasteca, 



Fig. 3. Zethus Montezuma, J , enlarged. Fig. 3, a. The head J seen 

 from before. 



30. Z. parTUllIS Sauss. — 9. Parvulus, gracilis, niger; clypeo con- 

 vexo, apice truncato, late subemarginato ; pronoto cristato-marginato, 

 utrinque angulato; post-scutello carina arcuata antrorsum convexa in- 

 structo, metanoto anguloso, supra carinulis 2 sinuatis e post-scutelli 

 angulis emergescentibns et postice convergescentibus, instructo ; petiolo 

 gracili, in medio campanulato, punctato; secundo segraento paulum in- 

 fundibuliformi. — Caput et thorax dense punctata, argenteo-sericea ; aiv 

 tenuarum articnlis 1-3 subtus, genibus, tibiis et tarsis, ferrugineis ; 



1 And slightly also those of the genus Elimus. 



