STIGMUS.— CEABEO. 141 



*/ 3. Stigmns montivagus. (Tab. VIII. fig. 23, $ .) 



Niger, coxis, trochanteribus, tarsis, tibiis, femoribus anticis tegulisque rufo-testaceis ; alis hyalinis. $ . 

 Long. 4-4| millim. 



Hob. Mexico, Chilpancingo 4600 feet, Omilteme 8000 feet (//. H. Smith). 



Head aciculate, almost opaque, the lower part more shining ; the front depressed in 

 the middle ; the clypeus projecting, finely punctured, transverse at the apex. Mandibles 

 clear yellow. Scape yellowish, the flagellum dull black beneath. Head rather sharply 

 narrowed behind the eyes. Thorax above alutaceous, opaque, the pleurae shining, 

 aciculate ; median segment shining, closely and finely striated, with a central and two 

 lateral (stout) keels, the rest with irregular reticulations. Pronotum not keeled above, 

 short, narrowed in front, at the apex crenulated, the edges rounded ; the mesopleurse 

 with two furrows, the lower one very deep and wide, forming a triangle ; the meta- 

 pleurse longitudinally striolated and aciculate ; there is a stout rounded keel at the base 

 of the median segment, and in the centre of the mesonotum are three polished lines. 

 Petiole curved, finely longitudinally striated, keeled laterally, nearly as long as the hind 

 femora. Basal joint of the middle tarsi shorter than the other joints united. 



The coloration of the legs varies somewhat ; the hinder tibiae are, for the greater 

 part, black. The tegulse are testaceous, the palpi and tubercles clear yellow. 



Pam. CEABKONID-aa. 



Very few species of this interesting family have been recorded from the Neotropical 

 zone, the Crabronidse being apparently more characteristic of temperate than of tropical 

 climates. Over one hundred species have been described from the Nearctic region ; 

 while the species known from the Palsearctic are very numerous. 



I have included Oxybelus as a subfamily. I am not sure, however, but that it 

 might be advantageously removed from the Crabronidse. 



Subfam. CRABRONINjE. 



CRABKO. 



Crabro, Fabricius, Ent. Syst. ii. p. 293 (1793). 



I am unable to accept the numerous genera (Solenius, Ceratocolus, Crossocerus, 

 &c.) formed by Saint-Fargeau and Dahlbom out of the Fabrician genus Crabro, chiefly 

 because the characters on which they were founded merge too much into each other. 



The Central-American species may be tabulated thus : — 



Abdomen not petiolate. 



Apical abdominal segment acutely pointed, narrowly compressed, 

 grooved ; $ fore tibiae normal. 

 Abdomen at base and the thorax rugosely punctured. 



Pronotum transverse, the edges acute , saxatilis. 



Pronotum subtransverse, the edges rounded championi, atitlana. 



