160 Journal New York Entomological Society, t^'o'- xxx. 



Canada : 



Ontario : Jubilee Point, i ,^. 

 Quebec : Three Rivers, i (j*. 

 Parallcla is easily separable from scricca and tristis by its lighter, 

 more rufous color; greatly reduced iridescence; greater extent and 

 prominence of erect clypeal hairs ; relatively longer and narrower 

 pronotum, showing the mid-lateral piceous spot and the same type of 

 dull, velvety surface in both sexes. 



Serica mystaca new species. 



This species so closely resembles parallela Casey that it can be sepa- 

 rated from it only with difficulty, if at all, except by the examination of the 

 male genital armature. When compared in series with parallela the follow- 

 ing average differences seem to obtain : mystaca is very slightly larger and 

 more robust in form, darker in color, often more distinctly iridescent (some- 

 times even approaching sericea in this character), and has somewhat coarser, 

 longer and more closely placed clypeal hairs, the clypeus is slightly wider 

 anteriorly, with the corners more broadly rounded and the anterior reflexed 

 margin more distinctly curved medially when viewed perpendicularly. 



The genital armature of the male shows rather more than the usual 

 amount of variation. In fact no two of the twelve armatures examined are 

 exactly alike. Sometimes the serrated angulation of the claspers is more 

 strongly developed (New York and Pennsylvania) than in the type as here 

 illustrated (PI. XIV). From this condition the angulation decreases in de- 

 gree until it is nearly or quite obsolete (North Carolina and Nebraska). 

 When viewed from the end the median arcuation of the claspers varies con- 

 siderably, and when viewed from the side the ventral prominence of the 

 stalk just below the claspers also varies somewhat in position and strength, 

 but is always rather well developed. The tips of the claspers are always 

 strongly flexed outwardly. Length of armature, 2.5 mm. 



5. Differs from the male by its distinctly smaller antennal club, 7.7 

 instead of 12, and somewhat smaller eyes, 8.2 instead of 9. 



Type: 1^. New Haven, Connecticut, April 20, 191 1 (Champlain). 



Allotype: $. New Haven, Conn., Apr, 21, 191 1 (Champlain). 



Paratypes: 16 (;^, 8$. 



Massachusetts : Cohasset, i c?. 



Rhode Island: " R. I.," i ^. 



Connecticut : " Conn.," i 9. 



New York: Bronx, i (^ ; Hudson, i (^. 



Pennsylvania: Harrisburg, i^\ Jeannette, i (^. 



New Jersey : Snake Hill, i 5- 



Illinois: "111.," 1$; " N. 111.," i c^; Carbondale, i^^; Ozark, i ^. 



Indiana : Posey Co., i ,^. 



North Carolina : " N. C," i ^. 



