the Ilymenoptera in the Dn'lish Museum. 451 



Apidse. 



IdIOPROSOPIS, goii. iiov. 



Characters. — r? . General facies that of Ifi/lwns. Head 

 broad ; as broad as luesotliorax at wi.lest, ocelli in a tiiati<rle 

 with very wide base. A distinct malar space, mandibles 

 medium, with two well-developed apical teeth. Joints 4-12 

 of antennse produced beneath apically to an angle, giving the 

 flagellum a serrate appearance; joint !i very long, equalling 

 in length JDints 4 and 5. Scape simple. Tongue mucli 

 as in IJyloeus. Pronotum visible, truncate anteriorly. Pio- 

 podeum subtruncate, concave medially, the anterior area not 

 differing iriuch in sculpture from the rest. Hind legs with 

 trochanters dentate, the feniora enormously incrassate and 

 tibite spatulate. First cubital cell twice as long as second, 

 basal nervure gently arched; stigma medium. Genital 

 armature with the stipites sim|)le, broadly obliquely truncate 

 at the apex ; sagittse short, falling far short of the apices of 

 the stipites ; apical process of eighth ventral segment dilated, 

 the apex emarginate. Six ventral segments are exposed, the 

 sixth broadly truncate at apex. 

 ? . Unknown. 



T} pe of the genus : Idioprosopis chalcidiformis^ M. -Waldo. 



Ge(»gra[)hical distribution of species : Patagonia. 



Id'iOi'rosopis clialcidiformis^ sp. n. 



<S . Ni^na ; mandibulis (apice excepto), labro, clypeo areisque inter- 

 orbitalibus pallidcluteis ; tibiisque posticis auranliacis ; anttnnis 

 scapo c\ Jindrieo, sparsim hirsato, liagelli artieiilis 4-12 scrratis ; 

 capite thoraccque sparsim griseo- pilosis, punctatis; abdomine 

 iiitido ; feraoribus posticis incrassatis, tuberculo subapicali in- 

 structis ; tibiisque posticis spatulatis, margine apicali deutato; 

 alis subhyalinis. 

 Long. 9 ram. 



J31ack ; the mandibles (except the apical teeth), labrum, 

 clypeus, and inner orbits pale ivorj-yellow j posterior tibiae 

 orange-yellow. Mandibles only shallowly grooved ; clypeus 

 convex, at apex broader than long. Antennae black above, 

 pale ferruginous beneath; scajje cylindrical, with a sparse 

 covering of long griseous hairs; joints 4—12 of tiagellum 

 serrate. Head and thorax for the most part dull, the whole 

 densely covered with shallow punctures; scutellum and 

 portions of propodeal area shining. Abdumen shining, im- 

 punctate. Head and thorax sparsely clothed with « lonf 



