ON SOME NEW CENTEAL AMERICAN VESPID^. 63 



second segment with a narrow, cylindrical petiole, fully half the 

 length of the rest, which forms a triangle, transverse at the apex, 

 where there is a row of large punctures ; the second margin is strongly 

 reflexed ; the apical half of the segment sparsely, weakly punctured, 

 the following three segments are more coarsely and closely punctured. 

 Tegulfe black, yellow at base and apex. 



Comes nearest apparently to Z. chicotencatl, Sauss., the male 

 of which is unknown. It belongs to Saussure's Section B. of 

 Didymogastra, which contains only South American species up 

 till now. 



Zethus (Didymogastra) claripennis, sp. nov. 



Black, densely covered with a grey pile ; a broad band on the apex 

 of the clypeus (almost the apical third), a line on apex of pronotum, 

 two squarish spots on apical half of scutellum, two large marks on 

 apex of metanotum, straight on inner side, rounded and narrowed on 

 outer side, a line on the apex of first abdominal segment above, a 

 broader, more irregular mark on the apical third of the sides, its base 

 narrowed, a line on the apical two-thirds of the base of the narrowed 

 part of the second segment, and a line round the apex of the latter, 

 bright lemon-yellow. Apical joints of antennae pale orange below. 

 Wings hyaline, iridescent, the nervures and stigma black. ^ . Total 

 length, 14 mm. 



North Mexico. 



Antenufe ending in a thickened spiral. Clypeus not much wider 

 than long, densely pilose, weakly, sparsely punctured, the punctures 

 hid by the dense white pile ; the apex with a short blunt tooth on 

 either side of the centre. Front and vertex rugosely punctured ; the 

 ocelli almost in a curve, the hinder separated from each other by about 

 the same distance they are from the eyes. Mandibles ending in two 

 teeth, the apical much larger than the basal. Mesonotum closely, 

 regularly, rather strongly punctured, without keels or furrows. Scu- 

 tellums more shining and less closely punctured, the apex of post- 

 scutellum broad. Metanotum obliquely sloped, depressed in the 

 middle, irregularly, transversely striated. Abdominal petiole longish 

 pyriform, two-thirds of the length of the thorax, not much narrowed 

 at the base, the top weakly, the sides more strongly punctured. The 

 narrowed base of the second segment is one-fourth of the length of the 

 rest, which forms a triangle, not much longer than it is wide at the 

 apex, which is flat, weakly punctured; the second border broad, re- 

 flexed. The thorax is not quite twice longer than wide, almost trans- 

 verse at the base, where there is a reflexed margin ; the apex becomes 

 gradually narrowed from the base towards the apex. 



Zethus [Didymogastra) fulvo-hirtus, sp. nov. 

 Black ; the top of the head and of the thorax densely covered with 

 fulvous pubescence ; the pubescence on the rest of the body not so 

 dense, and paler ; the first abdominal segment almost bare, the 

 second covered with a pale fulvous pile ; the under side of the antennal 

 scape, the raised base of thorax, a small spot on the sides of scutellum, 

 an interrupted line on the post-scutellum, two longish broad marks on 

 the metanotum, straight on the inner side, rounded and narrowed on the 



