442 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



2. Head with frons, often clypeus and lateral surfaces of pronotum 3'ellow or 



reddish brown Complex I. Bicolor (p. 443) 



Head and thorax entirely black or wholly or in part dark brown .... 3 



3. Abdomen narrow and rectangular in lateral view; only slight lateral compres- 



sion; triangular in cross section; propodeum sloping posteriorly with a deep, 



narrow, complete median furrow; ninth tergum and ventral valves in line 



with horizontal axis of abdomen . . Complex II. Pachyneuron (p. 444) 



Abdomen and propodeum not as above 4 



4. Abodmen may be strongly laterally compressed, viewed from the side elon- 



gate or broad to deeply oval; in cross section narrowly oval with greatest 

 width in upper one-third; ovipositor may be tilted dorsad in relation to 



longitudinal axis of abdomen Complex III. Gigantea (p. 444) 



Abdomen not strongly compressed; more nearly oval in outline in lateral 

 view and not greatly lengthened or deeply oval; ovipositor more nearly 

 in line with longitudinal axis of abdomen. 



Complex IV. Tylodermatis (p. 445) 



Group A. Petiolata 



1. Abdominal petiole longer than hindcoxa, very slender, approximately round 



in cross section; pronotum with 3-4 transverse ridges; abdomen extremely 



laterally compressed 1. phloeotribi Ashmead 



Abdominal petiole not longer than hindcoxa, not so slender; more nearly 

 triangular in cross section; ridges on pronotum absent 2 



2. Aljdominal petiole more nearly equal in length to hindcoxa 3 



Abdominal petiole distinctly shorter than hindcoxa 5 



3. Face with prominent striae converging on the clypeus ; abdomen elongate and 



laterally compressed; medium large species averaging 3.5 mm. in length; 



ninth tergum elongate and pointed .... 2. orchidearum (Westwood) 



Face nonstriated; abdomen short and plump; small species averaging 2-2.5 



mm. in length; ninth tergum short and blunt 4 



4. Propodeum with a prominent tubercle, dorsally, on each side of concavity; 



sixth tergum sculptured over entire surface; head entireh^ black. 



3. mammae, new species 

 Tubercles absent on propodeum; sixth tergum smooth and shining dorsally; 

 head yellow except for black area around ocelli and occiput. 



4. lycti Ashmead 



5. Forecoxa with a prominent raised ridge on anterior face outlining a deep, 



rounded depression 6 



Forecoxa without a prominent raised ridge on anterior face 11 



6. Legs yellow or orange yellow; black infuscation when present on hindfemora 



only 7 



Legs with black or dark-brown infuscation on femora and often on tibiae . 8 



7. Anterior ocellus not separated from two lateral ocelli by distinct carinae; 



anterior edge of pronotum without tubercles; eyes without emargination 



medially 5. dorcaschemae Ashmead 



Anterior ocellus separated from two lateral ocelli bj" raised carina; two 

 small tubercles projecting dorsally on anterior edge of pronotum; eyes 

 with prominent emargination medially ... 6. semicircula, new species 



8. Propodeum with lateral areas narrow and rounded; surface covered with 



irregular ridges and pits; median furrow narrow and indicated by lateral 



carinae in dorsal half 9 



Propodeum broad and concavity shallow; siu-face covered with fine uniform 

 punctations; median furrow absent 7. profunda, new name 



