12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.6!) 



0.558 ; width of mesoscutum, 0.334 ; length of fore wing, 0.841 ; width 

 of fore wing, 0.384 mm. 



Described from 32 females and 11 males (holotype female, allo- 

 type, and paratypes) reared from a species of Lecanimn (No. 57), 

 Austin, Texas, May 15, 1913 (Carl Hartman), No. 61. The speci- 

 mens were preserved in spirits before being mounted and many of 

 them are considerably bleached. The head of one of the male para- 

 types has been lost. 



This species is distinguished from P. testaceus (Ratzeburg) by 

 the more clavate antenna with the club obliquely truncate and by 

 the longer basal joint of the middle tarsi; testaceus is also said to 

 have the body considerably depressed, but this is not true of 

 hartinani. The coloration of the two species is apparently about 

 the same. Rhoj)oideus fuscus Girault, which was later transferred 

 by its author to Rhopus, should be cited as Pseudorhopus fuscus 

 and is distinguished from both hartmani and testaceus by the much 

 darker coloration and larger size. 



Type.—C2ii. No. 28141, U.S.N.M. 



HEXACNEMUS, new genus 



In Mercet's table of genera Hexacnetnus female runs to couplet 62, 

 where it runs out, as it agrees with neither alternative, the abdomen 

 being depressed and the antennae strongly filiform. In Girault's 

 table the female runs to the couplet containing I sodromoides and 

 Neocopidosotnyia^ but the face is not inflexed and the marginal vein 

 is punctiform. In Ashmead's table it runs to Pentelicus, but it dis- 

 agrees in many particulars with that genus. In Howard's table of 

 the Tetracnemini the male runs to Hexacladia on account of the six- 

 branched antennae, but is certainly not even closely allied to that 

 very characteristic genus. Howard's group Tetracnemini, with the 

 exclusion of Hexacladia and T anaostigma^ is perhaps a natural 

 group of which Hexacnemus forms a very distinct member. 



Genotype. — Hexacnemus armitagei^ new species. 



Female. — Head menisciform, thin frontooccipitally, about as wide 

 as the thorax and a little wider than long; in frontal view it is fully 

 rounded below and on the sides but depressed above, with a slight 

 emargination on each side of the vertex at the margin of the eyes; 

 in dorsal view appearing gently rounded in front, strongly rounded 

 at the sides and strongly incurved at the occipital margin; in side 

 view not quite uniformly convex from oral to occipital margin, being 

 slightly depressed below and thickest frontooccipitally a little above 

 the middle; occiput deej)ly concave, the dorsal margin acute. 

 Frontovertex moderately broad and widening below, the whole area 

 between the eyes over twice as long as its least width ; ocelli arranged 

 in a slightly obtuse-angled triangle, the posterior pair about one- 



