HYMENOPTERA FROM LOWER CALIFORNIA. 263 



with a well developed pygidial area which is smooth and 

 bounded laterally by a sharp ridge, in the $, this segment 

 is emarginate at apex into which the huge, curved spine 

 fits, which extends up from beneath. Wings ample, the 

 stigma large, lanceolate, at least half the length of the 

 marginal cell; the latter lanceolate, firmly united to the 

 costal margin its entire length. Three distinct submar- 

 ginals and an indication of a fourth, the second shorter than 

 either the first or third. Recurrent nervures received by 

 the second and third sub marginals. Basal vein confiuent 

 with the transver so-medial nervure in both sexes. Cubital 

 vein of hind wings originating a little before the apex of 

 the submedian cell in both sexes, rarely confluent with the 

 trans verso-medial nervure. 



Type, jE. rufiventris. This genus is allied to Myzine, 

 but is very distinct, as will be seen by the characters 

 given above. It is erected for Myzine rifiventris Cress., 

 and it is surprising that observers like Cresson and Cam- 

 eron (Biol. Centr. Amer. Hym., ii, p. 258) should have 

 overlooked such prominent generic characters as this 

 species possesses. Moreover, the ^ coloration — head, 

 thorax and first abdominal segment black, with the re- 

 mainder of abdomen bright red, is strikingly different 

 from any of the species of Myzine that I am aware of. 



The $ which has not before been noticed, is very 

 similar to the 6 ; the head is much more sparsely punc- 

 tured, and the thorax in general more coarsely sculptured, 

 except the mesopleurae, which are very densely punctured, 

 while in the 6 they have the punctures large and well 

 separated; abdomen above almost impunctate, else the 

 strong scattered punctures evident in the 6 are very 

 feeble; wings in the middle and at base hyaline, other- 

 wise fuscous, so that they appear bifasciate, hind pair 

 except apex hyaline; first and second joints of flagellum 



