OF WASHINGTON. 3 1 



speaking of it says: "The affinities of this genus are clearly 

 with Theocolax Westw., with which it agrees in the structure of 

 the thorax and abdomen and of its wings ; but the enormous de 

 velopment of the mandibles, the very deep and long suture on 

 the head, and the greater development of the basal abdominal 

 segments sufficiently differentiate the two." 



CEROCEPHALA Westwood, Mag. d. Zool. i., p. (1831). 

 (Type C. cornigera Westw.) 



Syn. Theocolax Westw., Lond. Edin. Phil. Mag., $d ser., i, p. 127 



Epimacrus Walk., Ent. Mag., i, p. 369 

 Lasthia Hal., Ent. Mag., i, p. 335 (1833). 

 Sciatheras Ratzb., Ich. d. Forstins., ii, p. 209 { 

 Tricoryphus Forst., Hymn. Stud., ii, p. 209 (1836). 



Head oblong oval, tridentate before from deep antenral furrows and 

 a sharp carina between. Ocelli 3, in a triangle. Eyes oval. 



Antennae clavate, inserted away from the clypeus, in the $ 10- or n- 

 jointed, the last two joints sometimes connate and apparently reducing 

 the number of joints ; in the 9 9-jointed, the club in the sometimes 

 jointed and giving a corresponding increase in the number of joints. 



Maxillary and labial palpi short. 2-jointed. 



Thorax long, the prothorax large, triangular, or quadrate, the meso- 

 notum with short, triangular scapulae, the scutellum without a transverse 

 impressed line before the tip, the metathorax more or less rounded off 

 posteriorly. 



Front ivings fringed, the marginal vein rather long, the stigmal and 

 poststigmal veins short. Females often wingless. 



Abdomen suboval or conic-ovate, longly petiolated, the ovipositor ex- 

 serted. 



Legs rather stout, hairy. 



Forster, as early as 1856,* united Theocolax with Cerocephala 

 and says: Walker hat in dem Ent. Mag., vol. ii, p. 149, Zwei 

 Arten angefiihrt, cornigera Westw. und formiciformis Westw. 

 Beide halte ich fur dieselbe Art, die in Bezug auf Farbung und 

 selbst auf die Kopfbildung, sowie nicht minder in der Grosse 

 bedeutend variirt. Oft sind nicht zwei Exemplare vollig gleich 

 gebildet. Der Name cornigera, als der altere, wiirde beibe- 

 halten werden miissen und die Synonymic ware folgende : 



Cerocephala cornigera Westw., Guerin Mag. d. Zool., prem. 

 Livr., pi. 4 (1831) cf. 



Theocolax formiciformis Westw., Lond. and Edin. Phil. Mag., 

 3d ser. i, no. ii, p. 127 (1832) 9. 



* Hymen. Stud, ii, p. 41. 



