Hymenoptera. 2*7 



71. Cubitus in hind wing originating at or beyond the transverse median nervure; 



our species small, with shining body. (Sierolomorpha.) COSILID^ 



Cubitus in hind wing arising far before the transverse median nervure; body 

 almost always conspicuously pilose (PL 3, fig. 45). (Mutflla, Sphseroph- 

 thalma, Ephfita, Pseudomethdca) Males of the MUTILLID^; 



72. Thorax undivided, the pro-, meso- and metathorax consolidated into a single 



piece, without visible sutures between them. (See couplet 71.) 



Females of the MUTILLDXflE 

 Thorax with at least one complete transverse suture 73 



73. Thorax divided into two parts. (See couplet 70.) 



Females of the MYRMOSDXE 

 Thorax divided into three parts 74 



74. Head long, usually distinctly longer than broad, flattened above, the front 



horizontal; legs stout. (See couplet 58.) . . Some females of the BETHYLID^ 

 Head transverse, subquadrate or rounded 75 



75. Antennae twelve-jointed; anterior tarsi not pincers-shaped (Methdca) 



THYNNIDJE 

 Antennae ten-jointed; front tarsi usually pincers-shaped (PL 5, fig. 92). (Gon- 



atopus.) (See couplet 59.) DRYINUXE, part 



Antennae thirteen-jointed; wings present as small pads (See No. 71.) 



A few male MUTILLnXE 



76. Hind tarsi slender, filiform, the first joint not broadened or thickened; hairs on 



body simple. Wasps 77 



Hind tarsi with the first joint thickened or flattened, often densely hairy; hairs 

 of body feathery or branched. Bees 93 



77. Middle tibiae with a single apical spur, or rarely with none 78 



Middle tibiae with two spurs 86 



78. Fore wings with only one cubital cell which is sometimes fused with the first 



discoidal (PL 3, fig. 58) 79 



Fore wings with two or three cubital cells (PL 3, fig. 52) 81 



79. Eyes not emarginate 80 



Eyes deeply emarginate within, a second cubital cell indistinctly defined. (See 



couplet 82.) TRYPOXYLONID^; 



80. First cubital cell separated from the first discoidal; scutellum and postscutel- 



lum simple, without spines or scales, eyes divergent above. (Crabro, Ana- 



crabro.) CRABRONID^; 



First cubital and first discoidal cells confluent; scutellum with a marginal lam- 

 ella on each side; postscutellum with a spine or forked process; eyes con- 

 vergent above. (Oxybelus, Notoglossa.) OXYBELED^ 



81. Abdomen strongly constricted between the first and second segments 82 



Abdomen without a strong constriction between the first and second seg- 

 ments 83 



82. Fore wings with two cubital cells; the second usually weakly defined, some- 



times not indicated; abdomen petiolate, long, slender, and enlarged apically; 

 eyes deeply emarginate within. (Tryp6xylon.) TRYPOXYLONID^E 



