88 HYMENOPTEEA. 



\f 2. PhilanthocephaluS maculiceps. (Tab. VI. figg. 3, head from in front, <j ; 



3 a, male organ.) 



Niger, laavis, capite et thorace flavo-maculatis ; segmento mediali lsevo; apice abdominis segmento 2° flavo 



tibiis tarsisque anticis flavis ; alis fere hyalinis, nervis fuscis, stigmate testaceo. £ d 1 . 

 Long. 12-15 millim. 



Hab. Mexico, Temax in North Yucatan (Gaumer). 



Head shining, almost impunctate, sparsely pilose; the cheeks and clypeus with 

 silvery hair. Clypeus convex, projecting a little at the apex ; the middle forming a 

 semicircular projection, which is larger than the lateral pieces and is margined. The 

 furrow from the ocelli is broad and deep nearly halfway to the antennae, then very 

 narrow and shallow, becoming wider and deeper towards the apex. The inner orbits 

 of the eyes, the edge of the clypeus, the base of the mandibles, two marks behind the 

 ocelli and two others lower down touching the occiput, are pale yellow. Antennae 

 stout, becoming gradually thicker from the third joint, which is twice the length of the 

 fourth ; the middle joints nearly as long as broad. Thorax shining, impunctate, sparsely 

 pilose ; the furrows on the mesonotum shallow ; the fovea at the base of the median 

 segment longer than broad, almost oval ; the apex of the median segment oblique, 

 deeply and widely furrowed ; the pronotum, one, two, or three marks on the scutellum, 

 the metanotum, two large marks on the median segment, the tegulae, and tubercles, 

 yellow. Abdomen shining, impunctate ; the petiole as long as the second and third 

 segments united ; the pygidial area almost impunctate, depressed before the apex ; two 

 marks on the apex of the petiole, a moderately broad line on the apex of the second 

 segment, and a much narrower and more indistinct one on the third and fourth, yellow. 

 Legs and wings almost as in P. Mrticeps. 



In the male the antennae are longer and somewhat more slender, and entirely rufous 

 beneath ; the clypeus and orbits are broadly yellow and densely covered with long 

 silvery hair ; the marks on the vertex are absent, or very much reduced ; the scutellum 

 is not marked with yellow ; there are no marks on the petiole ; and the belts on the 

 abdominal segments are much reduced in size, if not absent. 



A smaller species than P. meocicanus, and differing from it by the impunctate head, 

 the wide and deep furrow below the ocelli, the more projecting, rounder, and wider 

 apex of the clypeus, which is separated from the lateral pieces by a deep incision, the 

 impunctate median segment and pygidial area, &c. 



-4 3. PhilanthocephaluS gracilis. (Tab. VI. figg. 4, <j ; 4 a, head from in front ; 



4 b, male organ.) 



Niger, lsevis: facie, abdominis segmentis marginibus pedibusque flavis; alis hyalinis, nervis fuscis, costa 



stigmateque sordide testaeis. $ S . 

 Long. 10-11 millim. 



Hab. Mexico, Presidio (Forrer), Eio Papagaio 1200 feet, Chilpancingo 4600 feet, 

 both in Guerrero (H. H. Smith). 



