119] LEPIDOPTEROUS LARVAE— FR ACKER 119 



verruca on segments 1, 2, 7, 8, and 9 ; verrucae alpha often contiguous 

 on abdomen ; secondary setae rare or absent. Thoracic legs well devel- 

 oped ; prolegs normal on segments 3, 4, 5, 6, reduced or wanting on 10 ; 

 crochets uniordinal, either homoideous or heteroideous, arranged in a 

 mesoseries. 



Genera of Syntomidae : 



a. Verrucae reduced in size, each bearing a few long setae ; head bearing 

 long setae ; prothoracic legs much reduced. Lycomorpha 



aa. Verrucae well developed, at least alpha, beta, and rho consisting of 

 very numerous setae, 

 b. Verrucae kappa and eta of abdomen both well developed and bear- 

 ing numerous setae, 

 c. Verrucae kappa of segments 1 and 7 of the abdomen bearing 

 an enlarged group of clavate-plumed setae, tipped with black. 



Cosmosoma 

 ec. Verrucae kappa of segments 1 and 7 normal. 



d. Clypeus emarginate at tip, with a median semicircular con- 

 cavity ; front white, adfrontals black ; verrucae alpha of first 

 abdominal segment bearing a dark brown pencil. Lymire 

 dd. Clypeus not emarginate at tip; front concolorous with ad- 

 frontals; verrucae alpha of segment 1 normal, 

 e. Secondary setae absent on front; margins of front strongly 

 convex. Euccreon 



ee. Secondary setae of front rather numerous ; margins of front 

 nearly straight. Ctenucha 



bb. Verrucae kappa of abdomen abortive, either less than half the 

 size of verrucae eta or both rudimentary, 

 c. Verrucae beta of segment 8 bearing a pencil of setae at least 

 twice as long as those of verrucae beta on preceding segments. 



Syntomcida 

 cc. Verrucae beta on segments 1 to 9 all similar. 



d. Verrucae alpha and beta of abdomen much better developed 



than other verrucae, bearing a thick, short verricule on each 



segment. Pseudomya 



dd. Verrucae alpha and beta of abdomen similar to verrucae rho 



and kappa and those of the thorax. Scepsis 



The following species were examined : 

 Lycomorpha pholus Syntomcida epilais 



Cosmosoma myrodora Dy ar (1907) S. ipomeae 



Lymire edivardsii Pseudomya minima 



Eucereon confine Scepsis fulvicollis 



Ctenucha virginica Syntomis phcgea of Europe 



