500 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. &fc 



139. Abdomen short, broad-ovate, almost balf as broad on the third dorsal seg- 



ment as long ; hypopygium not quite attaining the apex of the abdomen ; 

 female antennae much shorter than the body. 



138. podunkorum (Viereck), 

 Abdomen not so short and broad, often somwhat compressed; the hypopy- 

 gium attaining the apex of the last dorsal abdominal segment 140. 



140. Second abdominal tergite largely smooth and shining ; female antennae very 



much shorter than the body 139. pyraiistae (Viereck). 



Second abdominal tergite entirely roughened; female antennae as long 

 as the body 140. phohetri (Rohwer). 



141. Third abdominal tergite roughened on basal half— 141. delicatus Howard. 

 Third abdominal tergite smooth 142, 



142. I'o.'sterior coxae somewhat granular above at base ; disk of scutellum wholly 



impunctate and highly polished; first and second abdominal tergites 



entirely roughened 147. 



Posterior coxae smooth and shining above ; disk of scutellum at least 

 indistinctly punctate; usually basal half of the first abdominal tergite 



and part of the second smooth and shining 143. 



143. Antennae yellowish beneath ; stigma transparent ; wing veins pale yellow- 



ish; length, 1.7 mm 142. ulyonquinorum (Viereck). 



Antennae dark brown or black; stigma and veins brown; larger species-144. 



144. Wings slightly infumated, the veins and stigma dark brown; the sub- 



discoideus distinctly pigmented all the way to the margin of the wing; 

 radius of the forewing oblique to the anterior margin of the wing, tend- 

 ing outward, and uniting with transverse cubitus in a very sharp angle ; 

 second abdominal tergite subtrinngular, defined laterally on basal half 

 by oblique grooves, and very narrow at base; a large, stout species. 



143. tmetocerae, new species. 



Wings hyaline; veins and stigma not so dark brown; subdiscoideus not 



pigmented to the margin of tlie wing 145. 



145. First and second abdominal tergites entirely rugulose and dull; all coxae 



and trochanters black ; radius of forewing about equal to the transverse 



cubitus 144. orobenae Forbes. 



First and second abdominal tergites more or less smooth and shining, at 

 least the first smooth and polished on basal half 146. 



146. Mesoscutum very shallowly, almost indistinctly, punctate ; hind coxae with 



a very conspicuous, punctate, oval, flattened area on the outer face 



above 145. hydriae, new species. 



Mesoscutum closely, distinctly punctate, the punctures confluent along the 

 lines where the parapsidal furrows would be if present ; hind coxae with- 

 out such flattened area on outer face above_146. fflomeratns (Linnaeus). 



147. Wings hyaline; abdomen elongate; suturiform articulation straight and 



very sharp ; female antennae as long as the body, the flagellum not pale 



basally 147. acromjctae liiley. 



Wings slightly infumated ; abdomen short-ovate ; posterior margin of sec- 

 ond abdominal tergite usually distinctly curving forward at the sides; 

 female antennae distinctly shorter than the body, the two basal flagellar 

 .segments pale 111. f/riffini (Viereck), in part. 



148. Abdomen entirely testaceous; propodeum and thoracic pleura more or less 



dark reddish to reddish-testaceous 148. flariventris (Cresson). 



Abdomen at least partly black; thorax entirely black 149. 



149. Inner spur of posterior tibiae longer than the outer, and at least a little 



longer than half the metatarsus 153. 



Inner spur of posterior tibiae not distinctly longer than the outer and not 

 quite half as long as the metatarsus 1.50. 



