Hymenoptera. 25 



strongly differentiated from the remainder of the abdomen; tegulse ab- 

 sent or much reduced; workers wingless. Ants (Formica, Camponotus, 

 Lasius, Myrmica, Crematogaster, Ponera) (PI. 4, figs. 65, 67). (Including 

 PONEHII)^, DOLICHODERID/E, MYRMICID^) . . .FORMICID^ 

 First segment of abdomen not scale-like or nodiform, although sometimes 

 constricted at apex 53 



53. Winged 54 



Wingless, or with the wings reduced in size 72 



54. Hind wings without distinct venation, with no closed cells (PI. 3, fig. 47) . . .55 

 Hind wings with well developed venation, with two basal cells and usually with 



the radius and cubitus extending beyond these (PI. 3, fig. 53) 61 



55. Mandibles in a reversed position, the apices directed laterally away from the 



mouth opening; abdomen with only two (female) or three (male) visible 

 dorsal segments, the first covering most of the abdomen (PI. 5, fig 84) . (Van- 



homia.) VANHORNIID-S 



Mandibles in the normal position, their tips meeting when closed 56 



56. Hind wings with a lobe at the anal angle, separated by a deep sHt-shaped 



notch 57 



Hind wings oval, without a deeply separated angle, although sometimes broadly 

 notched on the hind border 60 



57. Abdomen with three or four, rarely five, dorsal segments; metathorax laterally 



with sharp keels or teeth; ovipositor tubular, extensile, several- jointed; 

 body usually with coarse sculptvu-e and of metallic color. (Chrysis, Hedy- 



chrum, Hedychridium, Pamopes) (PI. 3, fig. 47.) CHRYSIDID^ 



Abdomen with at least six dorsal segments; ovipositor sting-like; not bril- 

 liantly metallic species 58 



58. Head oblong, rather flat above; antennae inserted at the clypeus, twelve- tO' 



thirteen-jointed (twenty-three-jointed in one rare genus); small, usually 



black or bronzed species, often wingless in the female; abdomen more or less 



elongate. (Epyris, Pseudisobrachium, Neoscleroderma) . . . BETHYLIDjE 



Head not oblong 59 



59. Head globose or rounded; antennae thirteen-jointed in the female, ten-jointed 



in the male; front tarsi of female simple. (Ampulicimorpha.) 



EMBOLEMID^ 



Head transverse or subquadrate; antennae ten-jointed; front tarsi of female 



usualfy pincers-shaped (PI. 5, fig. 92). (Dryinus, Gonatopus, Anteon, Boc- 



chus) DRYINID.ffi 



60. Fore wings with a broad stigma and a closed, usually very short, radial cell; 



abdomen with a short, cylindrical petiole, the second segment much longer 

 and larger then the others; small species (PI. 5, fig. 88). (Serphus (= Proc- 



totrypes)) {PROCTOTRYPIDM) SERPHID^ 



Stigma vei-y long and narrow; radial cell large, widely open apically; abdomen 

 very long and slender, and composed of equal cylindrical segments (female) 

 or clubbed, with the slender first segment as long as the rest of the abdomen 

 (male) (PI. 3, fig. 41). (Pelecinus.) PELECINED^ 



