l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



EOPTYCHOPARIA INTERMEDIA Rasetti, new species 

 Plate 3, figures 12-15 



Available material. — Nine cranidia. 



Description. — This species also can be described by pointing out 

 the differences from E. normalis. The glabella is less rounded in 

 front, presenting a slightly truncate appearance, and is also less promi- 

 nent. The anterior border is somewhat more elevated. The palpebral 

 area is on the average slightly downsloping instead of horizontal. The 

 anterior facial sutures from the palpebral lobe to the marginal furrow 

 are on the average parallel instead of divergent. Cranidia range from 

 2 to 5 mm. in length. 



Remarks. — It is apparent from the description that this species is 

 intermediate between Eoptychoparia and Onchocephalus, or more pre- 

 cisely between Eoptychoparia normalis and Onchocephalus sulcatus. 

 This fact shows the close relationship between the two genera. 



Occurrence. — Boulder G-19, Grosses Roches. 



Types.— Kolotype: U.S.N.M. No. 123867. Paratypes: U.S.N.M. 

 No. 123868. 



Genus ONCHOCEPHALUS Resser, 1937 



Description. — Glabella sloping down to a low anterior end, straight- 

 sided, truncated in front, with four pairs of shallow furrows. Frontal 

 area divided into preglabellar field and border ; marginal furrow usu- 

 ally with median inbend. Palpebral area slightly convex, usually 

 downsloping, 0.6 to 0.8 times as wide as the glabella. Palpebral lobes 

 about one-third as long as the glabella, at the level of the glabellar 

 midpoint. Posterior limbs about as wide (tr.) as occipital ring; distal 

 portion narrower (tr.) than proximal portion ; marginal furrow reach- 

 ing distal end of limb. Anterior facial sutures slightly convergent or 

 parallel in front of the eyes, then curving inward and rapidly con- 

 verging ; posterior branch curving backward to posterior margin. 



Type species. — Ptychoparia thia Walcott. 



Remarks. — Onchocephalus is chiefly characterized by the down- 

 sloping, truncated glabella, lack of divergence of the anterior facial 

 sutures, and the usually downsloping, at most horizontal, palpebral 

 area. Forms with less convergent facial sutures and horizontal pal- 

 pebral area intergrade with Antagmus or Eoptychoparia; species with 

 narrower palpebral area approach Crassifimbra; and forms with pro- 

 portionately smaller glabella link the genus to Luxella. 



The writer would include in the genus, in addition to the species 

 described by Rasetti (1951) and Lochman (1952), Antagmus soli- 



