19 



ward, with apical portion rather bhint and terminating in a short 

 hook; the dorsal margin strongly dentate and practically parallel to 

 the ventral margin of the whole clasp; the Proharpe slender, of even 

 width throughout, not much raised from the general plane of the 

 clasp, provided with numerous teeth ; the Lobe evenly rounded, the 

 portion interior to the Proharpe forming a slight ridge, extending 

 downward along the inner margin of same almost to its base. 



The Penis is slightly bent apically and bears on its distal margin 

 on each side a row of 4 minute teeth ; on the outer surface imme- 

 diately behind this row are two further rows of similar teeth, the 

 former containing three, the latter two teeth; a single tooth is also 

 present on the inner surface. 



We have had no opportunity to examine the $ organs, both speci- 

 mens before us having had the body stuffed, to the detriment of the 

 vaginal plate. 



Habitat, Mexico (Puebla, Durango). 



GENUS MEGATHYMUS Scud. (Type M. yuccae Bdv.) 



Megathymus Scudder, Rep. Peab. Ac. Sci., p. 83 (1872) (indesc.) ; id., Proc. 

 Am. Acad. Arts & Sci. 213 (1875) ; Riley, Tr. St. Louis Acad. Sci., 332 

 (1876); id., 8th Ann. Miss. Rep. 175 (1876); Kirby, Cat. Diur. Lep. 

 Suppl., 829 (1877) ; Dyar, Bull. U. S. Nat. Mus., 52, p. 46 (1902) ; Ma- 

 bille, Gen. Insect, Hesp., 185 (1904) ; Dyar, Jour. N. Y. Ent. Soc, XllI, 

 141 (1905); Skinner, Tr. Am. Ent. Soc, XXXVII, 171 (1911). (Key 

 to species.) 



Scudder did- not define the genus, merely specifying yuccae as the 

 type. 



Riley's detailed definition is as follows : 



"Head small, the width including eyes not much more than half of the 

 mesothorax ; the antennal bulbus large and the inter-antennal space not wider 

 than one of the sockets ; covered with rather evenly shorn, dense hairs, and 

 flattened scales not overhanging the eyes. Eyes small and smooth. No oceUi. 

 Labial palpi stout and short, not reaching to top of eyes, 3-jointed, the basal 

 joint broad but short, the middle joint 4 times as long, the terminal joint tuber- 

 culous and 1/6 as long as the preceding; clothed in short and thick hair-like 

 scales. Tongue filiform, rather more than >< the antennal length. Antennae 

 rigid, cylindrical, terminating in an elongate knob which is slightly flattened 

 and slightly tapering and recurved at tip, but without apical spine or tuft ; hav- 

 ing rather more {$) or rather less ( 9 ) than half the costal length of pri- 

 maries. Thorax very robust, recalling that of Xyleutes; clothed with close- 

 lying hair which becomes longer and looser behind ; the patagia rather broad, 

 forming two crescent-shaped, slightly raised layers ; the tegulae closely ap- 



