44 PROCEEDINGS OF THE NATIONAL MUSEUM. vol, 61. 



KEY TO THE NORTH AMERICAN SPECIES OF MICKOPLITIS. 



1. Second abdominal tergite emarginate posteriorly, provided with two longi- 



tudinal grooves medially, and usually somewhat roughened ; stigma large ; 

 radius decidedly longer than first intercubitus and usually perpendicular 

 to anterior margin of stigma; inner spur of posterior tibiae always half 

 as long as metatarsus; stigma broad, as long as the metacarpus. Large 



species, always more than 3 mm. in length 2. 



Second adbominal tergite not emarginate posteriorly, nor provided with 

 longitudinal grooves medially ; otherAvise not combining the above char- 

 acters 5. 



2. First dorsal abdominal plate distinctly narrower at apex than at base; 



stigma exceedingly large and with a pale spot at base. 



1. stigmaticus, new species. 



First dorsal abdominal plate either parallel-sided throughout, or a little 



broader at apex than at base; stigma unicolorous 3, 



3. Face without a distinct median carina extending from antennal fossae to 



clyi^eus; legs, including all coxae and femora wholly testaceous. 



2. rugosus, new species. 



Face with a distinct median carina extending from antennal fossae to cly- 



peus; at least the posterior coxae and femora partly black 4. 



4. Posterior coxae granular and opaciue above ; second abdominal tergite some- 



what roughened laterally ; median area on second tergite triangular In 

 outline, and broadest at base; scutellum coarsely rugulose and opaque. 



3. coloradensis, new species. 



Posterior coxae smooth and shining above ; second abdominal tergite wholly 



polished, the median area slender, not triangular ; scutellum with separate 



punctures, shining 4. perplexus, new species. 



5. Metacarpus much longer than stigm.a ; posterior coxae half as long as 



thorax; propodeum smooth and jwlished, with a median longitudinal 

 carina ; second abdominal tergite short, transverse, somewhat roughened. 



5. carinatus Ashmead. 



Metacarpus never longer, usually shorter, than the stigma; imsterior coxae 



never half as long as the thorax ; propodeum always rugulose 6. 



6. First dorsal abdominal plate slightly broader at apex than at base, very 



rarely not distinctly broader at apex than at base, and then the parap- 



sidal grooves distinctly impressed 7. 



First dorsal abdominal plate not at all broader at apex than at base, usually 

 decidedly narrower; if base and apex are of equal breadth, the parapsidal 

 grooves are not at all impressed 14. 



7. Parapsidal grooves wholly wanting, the mesoscutum and scutellum weakly 



punctate and shining; length 2.5 mm 6. kewleyi, new species. 



Parapsidal grooves distinct; length always more than 3 mm 8. 



8. Logs, including all coxae, bright testaceous; venter of abdomen mostly 



testaceous 9. 



At least the posterior coxae black ; venter usually mostly blackish 10. 



9. Stigma unicolorous; parapsidal grooves very strongly impressed; scutellum 



very broad, broader at base than long ; first dorsal abdominal plate about 

 one and one-half times its greatest breadth— 7. crenulatus (Provancher). 

 Stigma with a large pale spot in the membrane at base ; parapsidal grooves 

 fine, and not so strongly impressed ; scutellum a little longer than broad 

 at base; first dorsal abdominal plate distinctly twice as long as its 



greatest breadth 8. mamestrae Weed. 



10. Stigma with a distinct pale spot in the membrane at base ; dorsum of abdo- 

 men sometimes more or less testaceous beyond second tergite 11. 



