1912] Brazilian Ichneumonide and Braconide 223 
Eucystomastax gen. nov. 
Related to Cystomastax Szépligeti which it resembles in the peculiarly 
swollen palpi, but differing in the broadly sessile abdomen, longer 
submedian cell, smaller eyes, round metathoracic spiracles, etc. 
Resembling Rhogas in general habitus. Head transverse, narrowed 
behind the eyes; margined behind. Malar space as long as the mandible; 
eyes moderately emarginate opposite the antenne. Maxillary palpi 
5-jointed, with the first to third joints greatly swollen, but not flattened; 
labial palpi 3-jointed, first joint thickened, but cylindrical. Clypeus 
sharply projecting, with a porrect mystax of stiff black hairs. Ocelli 
moderately large and close together. Antenne setaceous, a little longer 
than the body. Thorax with the parapsidal furrows deep anteriorly, 
but abbreviated behind. Metathorax with a complete median and 
lateral carinz; its spiracles rather small, round; mesopleural suture 
complete, crenulated. Abdomen with a strong median carina on the 
first two segments; a little longer than the head and thorax; coarsely 
longitudinally aciculated on the first, second and base of third segment; 
first segment one-third longer than the second, less than twice as long as 
broad at tip; second segment slightly transverse; third twice as broad as 
long; fourth to seventh strongly transverse; all the sutures very deeply 
impressed. Legs long, rather slender, densely hairy. Wing with the 
marginal cell nearly reaching to the tip, stigma lanceolate, radius 
originating just before its middle; first section of radius one-third as 
long as the second; second transverse cubitus not swollen; not so stout 
as the other veins; recurrent nervure at the apical fourth of the first 
cubital cell; transverse median vein inserted beyond the basal third of 
the first discoidal cell; discoidal vein broken far below the middle. Hind 
wing with the submedian cell half as long as the median. 
Type. £. bicolor sp. nov. 
This genus may be separated from the related genera of 
Rhogadine having dilated palpi as follows: 
Ime ealpiwithe tae joimtsanipartdtlattened, leaf-like..- 4.05. .26.-006-0- sce chee ss 2 
Palpinwiulet hesjomusiswollen, but motilattened:.-s4ss.662) nao assess. le. 3 
2. Second section of radius twice as long as the first; upper and lower sides of 
second cubital cell parallel...........................Macrostomion Szep. 
Second section of radius less than twice as long as the first; second cubital 
cell distinctly narrowed toward its tip................ Pelecystoma Wesm. 
3. Metathoracic spiracles round; abdomen sessile....EHucystomastax gen. nov. 
Metathoracic spiracles slit-like; abdomen petiolate.....Cystomastax Szep. 
Eucystomastax bicolor sp. nov. 
Male. Length 9.5 mm. Black, with the base of the mandibles, 
fore coxe, and entire thorax except tip of metathorax, orange-yellow. 
Head twice as broad as thick, strongly convex below the antennz; the 
face with a short median carina just below the antennz; front smooth 
and shining, slightly concave; vertex and cheeks smooth; hind head 
punctulate; face smooth below on sides; elsewhere microscopically 
rugulose-punctulate. Mandibles with the upper tooth twice as large as 
