10 . PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



Genus MIRAX Haliday. 



Mirax- Haliday, Entom. Mag., vol. 1, 1833, p. 263; vol. 2, 1834, p. 230. 



Oenotype. — Mirax riifilahris Haliday (Monobasic). 

 Centistidea Rohwer, Psyche, vol. 21, 1914, p. 81. Genotype. — Centistidea 



ectoedcmiae Rohwer (Monobasic). 



Allied to Acoelius Haliday, but at once distinguished by the 14- 

 segmented antennae and the venational characters given in the key 

 to genera, also by having a distinct embossed plate on the first ab- 

 dominal tergite. 



Occiput immargined; eyes indistinctly hairy; parapsidal grooves 

 distinct anteriorly, entirely wanting posteriorly; radius obsolete, 

 merely indicated by a line of closely-placed setae; first intercubitus 

 attaining the stigma ; first cubital cell often not completely separated 

 from the first discoidal; spurs of posterior tibiae short; first and 

 second abdominal tergltes largely membranous, with slender embossed 

 median plates. 



KEY TO THE NORTH AMERICAN SPECIES OF MIRAX. 



1. Vertex with a polished groove extending from the median ocellus to the occi- 



put; basal segment of antennal flagellum not distinctly longer than the 

 second 2. 



Vertex without such a groove from tlie median ocellus to the occiput; basal 

 segment of antennal flagellum decidedly longer than the second -- 3. 



2. Head and thorax testaceous; abdomen testaceous beyond second tergite; 



second dorsal abdominal plate very finely striate laterally. 



1. pallida Ashmead. 



Thorax mostly brownish-black; abdomen blackish beyond second tergite; 



plate on the second tergite not striate 2. lithocolletidis Ashmead, 



3. Head, including antennae, entirely yellow ; all legs and the two basal 



abdominal segments yellow 3. texana, new species. 



Head black 4. 



4. All coxae and femora strongly infuscated ; tegulae and wing-bases bro^vn. 



4. aspidiscae Ashmead. 

 All coxae and femora yellow; tegulae and wing-hases pale yellow 5 



5. Propodeum highly polished, with several. distinct longitudinal striae or rugae 



on either side of the median carina ; length 2 mm. 



5. ectoedemiae (Rohwer). 

 Propodeum without such striae or rugae ; length hardly 1 mm. 



6. minuta Ashmead. 



1. MIRAX PALLIDA Ashmead. 



Mirax pallida Ashmead, Psyche, vol. 6, 1893, p. 379. 

 Type. — In the United States National Museum. 

 Closely allied to lithocolletidis., differing only as noted in the key. 

 Jacksonville, Florida. 

 Known only from the unique type. 



2. MIRAX LITHOCOLLETIDIS Ashmead. 



Mirax lithocolletidis Ashmead, Psyche, vol. 6, 1893, p. 378. 

 Type. — In the United States National Museum. 



