62 



THE ENTOMOLOGIST. 



ON SOME NEW CENTRAL AMERICAN VESPIMI. 



By P. Cameron. 



Zethoides, Cam., non Fox. 

 The name of this genus I changed into Plesiozethus in the 

 'Entomologist,' 1904, p. 269. Mr. Albert Schulz, not being 

 aware of this, has proposed for it, in his laborious work, ' Spolia 

 Hymenopterologica,' p. 213, 1906, the name of Metazethoides, 

 which is, of course, useless. 



Zethus (Didymog astro) lamellicollis, sp. nov. 

 Black, densely covered with fulvous pubescence ; the clypeus, 

 mandibles, except the apex and lower edge, under side of antennal 

 scape, two small spots over the antennas, a line behind the raised keel 

 of pronotum, a small spot on the sides of scutellum, two lines on centre 

 of post-scutellum, two longish pyriform marks (the narrowed end above) 

 on the nietanotum, a broad line on the sides of apex of abdominal 

 petiole, with an oblique incision on the apex above and continued as a 

 broader mark, narrowed on the inner side to near the middle of the 

 segment above, and lines on the apices of the second to fifth segments, 

 and a curved spot (the narrowed end at the base) on the apex° of the 

 petiole of second segment, bright lemon-yellow ; the apical half of 

 anterior femora, the middle in front, the apex of the hinder below, and 

 the tibiae except behind of a paler yellow colour. Flagellum of 

 antennae orange-yellow below towards the apex. Wings° hyaline, 

 suffused with fuscous, the nervures and stigma black. °^. Total 

 length, 17 mm. 



North Mexico. 



Antennae with a stout hook, narrowed towards the apex. Clypeus 

 wider than long, its apex black, and bearing two short, black, widely 

 separated teeth ; the punctuation is distinct, but not very strong or 

 close. Mandibles with three teeth, the basal two shorter and blunter 

 than the apical. Front and vertex closely, strongly punctured ; the 

 temples broad, roundly narrowed, the occiput sharply keeled. Ocelli 

 in an equilateral triangle, the latter separated from each other by the 

 same distance they are from the eyes. Base of thorax raised into 

 a transverse plate, which forms a furrow with the part behind, and is 

 continued along the pronotum to near the tegulae, this lateral plate 

 becoming shorter towards the apex. Mesonotum strongly, closely 

 punctured, more closely on the basal than on the apical half; the 

 former has a keel down the middle. Scutellum more shining and less 

 pilose than the mesonotum ; its punctures are more widely separated ; 

 it is not raised above the mesonotum. Post-scutellum rounded' 

 broadly narrowed towards the apex ; strongly punctured and covered 

 with long hair. Metanotum with a rather steep slope, stoutly, 

 obliquely striated. Propleurae smooth, the mesopleurae rather strongly 

 punctured ; the metapleurae opaque, obscurely striated. Abdominal 

 petiole smooth, shining, as long as the thorax, the basal third narrowed, 

 the rest forming an elongated oval, depressed above at the apex ; the 



