CHARLES W. HOOKER. 51 



Genus RETANISIA Cam. 



Retanisia Cameron, Biol. Centr. Amer,, Hym., I, p. 299 1886. 



Ashmead, Proc. U. S. Nat. Mus., No. 1206, pp. 87, 



184 (Vol. XXIII, 1900) 1900. 



Dalla Torre, Cat. Hym., Ill, p. 179 1901. 



Szepligeti, Gen. Ins., Hym., 34n'e Fasc, pp. 36-37 1905. 



Parapsidal furrows deep ; claws not pectinate ; abdomen not much 

 longer than the head and thorax together, gradually dilated to the 

 fifth segment ; discocubital cell receiving both recurrent veins ; median 

 tibiae with two apical spurs ; antennae long, filiform. 



Generic type R. facialis Cam. (monotypical). 

 Cameron characterizes the genus as follows : 



" Head as broad as the mesonotum, about one-half broader than 

 long. Clypeus almost transverse at the apex, but with the sides 

 rounded ; labrum small, rounded. Eyes not incised on the inner side. 

 Parapsidal furrows deep and wide, reaching nearly to the scutellar 

 fovea, which is wide and deep. Scutellum longer than broad, not 

 much elevated, narrowed toward the apex, which is rounded ; the 

 sides are keeled. Metathorax gradually sloping to the apex, long- 

 ish, with more or less distinct arese. Abdomen not very much longer 

 than the head and thorax united, becoming gradually dilated to the 

 fifth segment. Hind legs very long; the coxee longer than the tro- 

 chanters, the tibiae nearly as long as the coxae, trochanters and femora 

 united ; the tarsi a little shorter than the tibiae ; the hind tibiae having 

 two short thick spurs, the anterior pair a longer and more curved one. 

 The matatarsus is scarcely twice the length of the next joint, and the 

 basal joint of the anterior tarsi is curved at the base. In this genus 

 the cubital cell receives both the recurrent nervures, and therefore 

 agrees with Thyreodon, Ophion, Nototrachys, Ophiopterus and Aga- 

 thophiona. From Thyreodon it may be known by the abdomen not 

 being strongly compressed laterally, the much longer legs and antennae, 

 the eyes entire and the claws not pectinated ; from Nototrachys by the 

 long antennae and the shining mesonotum ; from Ophion by the abdo- 

 men not being compressed, the eyes entire, and the now pectinated 

 claws ; from Ophiopterus by the very long antennae and legs, and the 

 dilated abdomen ; and from Agathophiona by the normal length of the 

 labium, the long antennas, the much longer legs, and the much shorter, 

 more dilated and thickened abdomen ; and from all five by the very 

 deep parapsidal furrows, The antennae in the male — the only sex 

 known — are longer than the body ; the joints contracted in the mid- 

 dle, dilated at the base and apex ; the third joint about one-fourth 

 longer than the succeeding ones ; towards the apex the joints become 

 very slightly narrowed." 



TRANS. AM. ENT. SOC. , XXXVIII. 



