STREPSIPTERA 



TABLE UV GENERA 



i a . Male maxillae with first joint longer than second; oedcagussti ongly arcuate 



beneath at middle i. Genus Haijctoxenos, fierce. 



ib. Male maxillae with first joint shorter than second; oedeagus not strongly 



arcuate beneath at middle; wings with two detached branches of radius 



and two of medius, between radius and medius 2. Genus Apkactei.ytra, Pierce. 



1. Genus HALICTOXENOS, Pierce 



Halictoxenos. Pierce, Proc. Ent. Soc. Wash. Vol. g, p. 82 (1908); Bull. U. S. Xat. Mus. no. 66. 

 p. 147 (1909). 



Characters. — Male. — Head and eyes normal. Maxillae with first joint longer than second; 

 mandibles straight on posterior edge, sides parallel to middle, where anterior edge is suddenly narrowed, 

 thence tapering to a blunt apex. Antenna? four-jointed, the third joint laterally produced. Prothorax 

 transverse. Mesothorax transverse ; elytra long. Metathorax elongate ; prasscutum much broader in front 

 than behind, posterior edge bisinuate; scuti rather widely separated; scutellum elongate, almost twice 

 as long as prasscutum, sides sinuatelv narrowing towards front, but not becoming approximate; post- 

 lumbium very long; postscutellum elongate, apically rather broadly rounded. Tarsi four-jointed. 

 CEdeagus evenly curved near base, strongly arcuate beneath at middle, probably angulate near apex. 



Female. — Cephalothorax almost triangular, lateral margins sinuate; five genital tubes entering 

 brood-canal. 



The genus is divided into four subgenera on the basis of differences in the female cephalothorax. 

 There is little doubt, but that each will be entitled to generic rank when the males are known. 



TABLE OF SUBGENERA 



ia. Female cephalothorax triangular, narrowly and roundingly 



truncate at apex, obviously constricted at base of head ; 



breadth of cephalothorax at widest point i.p to j.3 times 



as wide as breadth of head at base 1. Subgen. Halictoxenos, Pierce. 



ib. Female cephalothorax less apparently triangular, broadly 



and evenly rounded to apex with very slight sinuations 



at sides; breadth of cephalothorax at widest point 1 .7 times 



as wide as breadth of head at base 2. Subgen. Halictophilus, Pierce. 



ic. Female cephalothorax almost triangular, narrowly truncate 



at apex ; head about one-third as wide as metathorax at 



spiracles 3. Subgen. Halictosi ylops, Pierce. 



id. Female cephalothorax very broad at base, triangular, 



convexly truncate at apex, strongly constricted at base of 



head; breadth of cephalothorax at 'widest point 1 .5 times 



as wide as breadth of head at base 4. Subgen. Avgochlorophilus, nov. subgen. 



