BASSUS.— MESOLEPTUS. 281 



BASSUS. 

 Bassus, Fabricius, Syst. Piez. p. 93. 



This genus is numerously represented in the Palaearctic and, to a less extent, in the 

 Nearctic Region. In our country it has only been met with in the mountains of 

 North Mexico, where the fauna is of a more mixed nature than further south, i. e. 

 there is a considerable mixture of northern species. 



1. Bassus frontalis. (Tab. XI. fig. 8.) 



Bassus frontalis, Cresson,. Trans. Am. Ent. Soc. 1868, p. Ill ( ? )\ 



Eab. Noeth America, United States 1 . — Mexico, Milpas 5900 feet (Forrer). 



The Mexican specimen is a male, and it does not materially differ in coloration from 

 the female. 



MESOLEPTUS. 



Mesoleptus, Gravenhorst, Ichn. Europ. ii. p. 3; Cresson, Trans. Am. Ent. Soc. ii. p. 33 (1868). 

 An extensive genus of wide distribution. 



1. Mesoleptus calidus. 



Mesoleptus calidus, Cresson, Trans. Am. Ent. Soc. 1868, p. 33 ( <J ) 1 ; Proc. Acad. Phil. 1873, p. 390. 

 Eab. Mexico, Hacienda del Potrero, near Cordova 1 (Sumichrast). 



2. Mesoleptus melleus. 



Mesoleptus melleus, Cresson, Trans. Am. Ent. Soc. 1868, p. 34 (6) 1 ; Proc. Acad. Phil. 1873, p. 390. 

 Eab. Mexico, Hacienda del Potrero, near Cordova 1 (Sumichrast). 



3. Mesoleptus aztecus. 



Mesoleptus aztecus, Cresson, Proc. Acad. Phil. 1873, p. 390 ( <$ ) \ 

 Eab. Mexico, Orizaba 1 (Sumichrast). 



4. Mesoleptus mexicanus. (Tab. XI. fig. 22.) 



Flavus ; flagello antennarum, mesonoto (lineis 2 flavis exceptis) abdominisque apice late, nigris ; alis flavo- 



hyalinis, stigmate testaceo. c? . 

 Long. 15 millim. 



Eab. Mexico (SalU). 



Antennas filiform, longer than the body. Face closely, the clypeus scarcely, punc- 

 tured; face sharply projecting below the antennae; tips of the mandibles, the head 

 behind (except the orbits), and the vertex, black. Thorax closely punctured, the 

 punctures running into striations on the pleura?. Metanotum without any carina? 

 (except a transverse one at the apex), with an almost gradual slope from the base to 



biol. cente.-amee., Hymenopt, April 1886. 2 oo 



