TRYPOXYLON. 41 



ii. Medium-sized species, with the wings almost hyaline but fuscous along the costa. 

 a. Abdomen black, reddish at the base of the second segment. 



v 3. Trypoxylon mexicanum. 



Trypoxylon mexicanum, Saussure, Reise d. Novara, Hymen, p. 78, t. 4. figg. 45, 45 b \ 

 Hab. Mexico, Tampico \ Jalapa x . 



^ 4. Trypoxylon aztecum. (Tab. IV. fig. 2.) 



Trypoxylon aztecum, Saussure, Reise d. Novara, Hymen, p. 80 l . 



Sab. Noeth America, San Lucas in Lower California 1 . — Mexico, Presidio (Forrer),. 

 Pueblo viejo near Tampico 1 , Teapa in Tabasco (H. H. Smith), N. Yucatan (Gaumer). 



v 5. Trypoxylon lactitarse. 



Trypoxylon lactitarse, Saussure, Reise d. Novara, Hymen, p. 81 \ 

 Hob. Mexico, temperate region and eastern cordilleras 1 . 



v 6. Trypoxylon luteitarse. 



Trypoxylon luteitarse, Saussure, Reise d. Novara, Hymen, p. 82, t. 4. figg. 47, 47b 1 . Wi^of. Z^^tr-^ im^cmu~ jfc**s*j»*'*^~ 

 Hab. Mexico, eastern cordilleras 1 . c n * 



^ 7. Trypoxylon carinifrons. 



Nigrum, argenteo-hirtum, basi antennarum, tibiis, tarsis anticis basi abdominisque segmento 2° sordide rufis ,- 



alia fere hyalinis, cellula marginali fumata. 

 Long, fl millim. 



Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith, May 1888). 



The five basal joints of the antennee broadly obscure rufous beneath ; the third joint 

 fully one quarter longer than the fourth; the apical joint rufous. Head opaque, 

 coarsely alutaceous ; eyes at the ^pp separated by nearly the length of the second and 

 third antennal joints united. An obscure furrow runs down from the ocelli; and 

 opposite the top of the eye-incision in the middle is a stout transverse keel crossing the 

 longitudinal furrow. Clypeus broadly carinate. The face, eye-incision, cheeks, and 

 clypeus densely covered with silvery pile. Thorax shining, minutely but obscurely 

 punctured ; the metanotum obscurely transversely striated ; the pronotum, the sides of 

 the mesonotum, and the greater part of the metanotum densely covered with silvery 

 hair. Metanotum with a gradual rounded slope ; a distinct continuous furrow in the 

 centre of the apical half. Abdomen petiolated ; nearly twice the length of the thorax ; 

 the first and second segments shining, obscure pale rufous beneath, but faintly pilose ; 

 the petiole twice the length of the second segment, dilated at the base, the latter 

 almost longer than the third ; from the third the segments bear a close cinereous pile, 

 observed as oblique bands. The wings have the apex from the stigma to the end 



biol. CENTE.-AMEE., Hymenopt., Vol. II., February 1889. gg 



