52 PROCEEDINGS OF THE ACADEMY OF [1896. 



Head ordinary, face not so hairy ... 57 asteris 9 var. 



83. Abdomen black or dark brown, without pale marks ... 84 



Abdomen not banded, but with yellow marks 86 



Abdomen distinctly banded 87 



84. Cheeks armed, head large, clypeus with a narrow median 



line and broad anterior border yellow, two yellow spots 



above clypeus 60 grandiceps $ 



Cheeks unarmed, clypeus all pale except the usual dots . . 85 



85. Lateral corners of clypeus reaching base of mandibles, mar- 



ginal cell shorter 3 californica $ 



Lateral corners of clypeus not reaching base of mandibles, 

 marginal cell longer 61 crassiceps $ 



86. The yellow abdominal marks oblique, dog-ear marks rep- 



resented by dots only 9 nevadensis 9 



The yellow abdominal marks small and straight . 46 tarda S 



87. Males 88 



Females 92 



^^. Cheeks armed 6 ventralis. 



Cheeks unarmed 89 



89. Mesothorax granular, abdominal bands without lateral 



bulgings on proximal margin, face-markings deep yellow, 



22 sjyhoiralcece var. 

 Mesothorax smooth and shining 90 



90. Middle and posterior femora yellow, without black patches, 



abdominal bands regular, though with sublateral bulg- 

 ings on proximal margins, marginal cell longer, 30 duhia S 

 Middle and posterior femora with black spots or patches, 

 marginal cell shorter 91 



91. Siipraclypeal mark very little broader than long, 23 zebrata $ 

 Supraclypeal mark nearly twice as broad as long .... 



24 hakerce $ 



92. Nervures colorless ; pale stripe along anterior orbits not 



extending to level of middle ocellus .... 40 salicis. 



Nervures dark ; pale stripe along anterior orbits extending 



to level of middle ocellus 36 exclamans. 



Species of Texas and Mexico, ivitli the mandibles bifid at tips, the 

 head large, the digma subobsolete, the abdomen broad, rufous in the 

 S , black or piceous in the 9 • 



1. Perdita texana (Cr.) Cr., Cat. Hym., 1887, p. 296. 



9 Macrotera texana Cr., Tr. Am. Ent. Soc, 1878, p. 70. (Hab., Texas). 

 cf Macrotera me<jacephala Cr., 1. c, p. 71. (Hab., Texas). 



This species was discovered by Mr. L. Heiligbrodt, who took three 



