1903.] 191 



Humeral a. petiolate Dineura. 



37 (35) Discoidal n. and Ist medial ». converge strongly, and the humeral a. is 



not petiolate (Hoplocampides) 38. 



Either the discoidal n. and the let medial n. are subparallel ; or, if they 



converge, the humeral a. is petiolate 41. 



38 (37) Antennae with 10 joints or more Phyllotoma. 



Ant. with 9 joints or less 39. 



39 (38) 4n<. with only 7 joints Heptamelus. 



Ant. with 9 joints 40. 



40 (39) Humeral a. with oblique cross M Eriocamp aides. 



Humeral a. contracted (N.B. the basal part of the humerus is often very 



faint, but always present) Hoplocampa. 



41 (37) The 1st medial n. runs towards the base of the stigma, the discoidal w. 



strikes the subcosta far before the origin of the cubitus. The gense 

 are very short, and the two medial nn. are both received in the second 



cubital cell. (Humeral a. petiolate) 42. 



The two medial nn. are received in different cells 43. 



42 (41) The radial n. the 2nd cubital w. and the 2nd medial n. are interstitial — 



forming a practically unbroken line. The humerus in the h. w. is 

 normally developed Mesoneura. 



The nn. mentioned above are not interstitial, and the humerus in h. w. is 



obliterated Pseudodineura. 



43 (41) Humeral a. always really petiolate, though in Kaliosysphinga it looks 



rather contracted 44. 



Humeral a. not petiolate 55. 



44 (43) Eyes remote from mandibles. M. w. with a medial n. present (" enclosed 



discoidal cell ") 45. 



Eyes close to mandibles, or else there is no medial n. in h. w 48. 



45 (44) (J h. w. has " continuous external neuration " (Fig. 5), ? ss. (seen later- 



ally) gradually tapers to a point at apex Periclista. 



(J h. -w. with normal neuration : $ ss. (seen laterally) either rounded, or 



suddenly acuminated at apex 46. 



46 (45) Grense about as long as the 2nd joint of ant Pareophora. 



Q-ense not half as long as the above joint 47. 



47 (46) Ant. rather short and stout, the 3rd joint considerably longer than the 



4th ( ? ss. acuminate at apex) Ardis. 



Ant. slender, 3rd and 4th joints subequal ( ? ss. rounded at apex, viewed 



laterally) Rhadinocercea. 



48 (44) 3rd joint of ant. plainly shorter than 4th (large black species)... 



Phymatoceros. 



3rd joint of ant. longer than 4th 49. 



49 (48) Cubitus bent sharply (almost at a right angle) near its base. 1st cubital 



n. completely wanting 53. 



Cubitus normal. 1st cubital n. present, or at least indicated 50. 



50 (49) Mesothorai with "distinct prsesterna " (Fig. 9). S. to. in most cases 



has a medial n. (" enclosed discoidal cell ") Tomostethus. 



Prsesterna not defined. ^. zo. without a medial « 51. 



