148 HYMENOPTEEA. 



defined, furrow; the apex strongly transversely striolated. Mesopleurae coarsely 

 longitudinally punctured ; metapleurae finely longitudinally rugose. There is no 

 furrow between the epimera and sternum of the mesothorax. Meso-metapleural 

 furrow crenulate, wide. Abdomen shining, very finely and minutely punctured, 

 almost aciculate. Pygidial area hollowed, aciculated and opaque at the apex. Legs 

 normal, covered sparsely with soft white hair ; the tibial spines short, blunt, stout ; 

 calcaria white ; the long spur of the hind tibiae reaching nearly to the middle of the 

 metatarsus ; the tarsal joints whitish at the apex beneath. Transverse cubital nervure 

 received distinctly before the middle of the radial cellule. The scape of the antennae 

 and the mandibles (except at the base and apex) citron-yellow ; the collar, tubercles, 

 metanotum, and a line on the sides of the abdominal segments 1-5 reddish-yellow. 

 Clypeus covered with a dense golden pile ; the cheeks and vertex with a long fuscous 

 pubescence ; thoracic pubescence longish and pale ; penultimate and last abdominal 

 segments fringed with long stiff golden hair. 



9. Crabro costancensis. (Tab. IX. fig. 9, ? O^g^C^^II^^^^^ 



Niger, scutello, metanoto, abdominis 6 maculatis apiceque petioli flavis; alis fere hyafinis, nervis nigris. $ . 15',-u, (oJifSt^ 

 Long. 8 millim. 



Hob. Costa Rica, Rio Sucio (Rogers). 



Head opaque, finely and closely punctured, clothed with short pile. Ocelli in pits, 



almost in a triangle ; the hinder ocelli, if anything, separated by a greater distance 



from each other than they are from the eyes. An oblique furrow runs from the eyes 



to the hinder ocelli ; and a broader one runs from the front ocellus to the frontal 



depression. Clypeus moderately convex, bluntly keeled down the centre ; the apex 



depressed, margined, slightly incised in the middle. Thorax opaque, like the head ; 



the pronotum wide, rounded, the sides obliquely truncated ; the top not much 



elevated above the prosternum; mesonotum furrowed down the centre; the pleurae 



opaque, minutely and closely punctured ; an oblique furrow running from the point of 



insertion of the fore wings to the propleurae. Scutellum shining, punctured. Central 



area of the median segment distinctly separated, shining, a wide margined aciculate 



hollow in its centre, the sides strongly striolated ; the rest of the segment opaque, finely 



and closely punctured, densely covered with longish silvery hair ; the apex of the 



segment' furrowed in the middle, obliquely sloped. Abdomen shining, aciculate. 



Legs stout, covered with pile ; the tibiae stoutly spinose ; the long spur of the hind 



tibiae reaching to the middle of the metatarsus, which is grooved and somewhat longer 



than the following three tarsal joints united. The transverse cubital nervure is received 



almost in the middle of the radial cellule. The scape of the antennae, an interrupted 



line on the pronotum, the tubercles, scutellum, post-scutellum, a complete band on the 



first abdominal segment and a widely interrupted one on the second and third segments, 



