LELUTHIA.— CHELONUS. 393 



" Antennae 25-jointed, covered with a dense microscopic pile, longer than the body, 

 the second joint a little longer than the third. Head closely and somewhat strongly 

 punctured, sparsely covered with white hair; eyes margined; mandibles dark testa- 

 ceous ; palpi long, white. Thorax covered with rather long whitish hair ; closely 

 punctured, except the centre of the mesopleurse, which is shining and smooth; 

 metathorax irregularly reticulated, the sides rather more punctured than reticulated ; 

 an aciculated space on either side at the base of the metanotum. Abdomen with the 

 basal two segments, and also the base of the third segment, longitudinally striolated ; 

 the petiole much more strongly longitudinally striolated, and the third segment also, 

 but less distinctly so than the second ; the other segments shining, smooth, testaceous at 

 the apices. The aculeus is pilose, dull testaceous, the apex black. The legs are 

 covered with white hair, the tibiae and tarsi much more densely than the femora; 

 coxae strongly punctured ; the femora are black, except at the base and apex and 

 the front pair beneath. Wings : the transverse basal nervure received not far behind 

 the transverse humeral nervure ; the recurrent nervure not interstitial ; the first trans- 

 verse cubital cellule almost, if not quite, obliterated; the second cubital cellule 

 wider at the base than at the apex, through the cubital nervure bending downwards at 

 the base, and on the lower side a little longer than the first. 



Division CRYPTOGASTRI. 

 Subfam. CHELONINJEJ. 



CHELONUS. 



Chelonus, Jurine, Nouv.- Methode de Class, les Hymen, p. 289 (1807). 



A genus of very wide distribution, and numerous in species. 



1 (2). Base and apex of the abdomen with two round reddish spots . . . quadrimaculatus. 



2 (1) . Base of the abdomen marked with white. 



3 (6) . Scutellum shining, only finely punctured. 



4 (5) . Wings hyaline throughout, the base of the abdomen entirely white . basimacula. 



5 (4) . Wings smoky in front of the stigma, the base of the abdomen with 



two white marks sonorensis. 



6(3). Scutellum and thorax rugose annulipes. 



1. Chelonus quadrimaculatus. (Tab. XVI. fig. 5, $ .) 



Niger, geniculis, tibiis tarsisque pro parte albis ; thorace punctulato ; abdominis maculis 4 rufis ; alis hya- 



linis. $ . 

 Long. 4 # 5 millim. 



Eab. Mexico, Northern Sonora {Morrison). 

 biol. centr.-amer., Hymenopt., April 1887. 3ee 



