NORTH AMERI(!AN LEFIDOPTERA. 89 



Xo othei" coiiiparative description or synopsis of this group is given 

 by Mr. Grote, and he contradicts his conclusions and negatives the 

 value of one of his chief characters by classifying luiiformts and 

 floridends, with entire margins, as varieties of thyttbe with dentate 

 margins. As to floridensis he revokes this determination, but leaves 

 uniformis as a variety, abandoning the principle. 



In vol. 2 of the same journal, p. 147, he gives a table of some spe- 

 cies of the other section as follows : 



Teriiiinal hand of primaries even on its inner ed^ie toiiiiis. 



Terminal band interspaceably roundedly exserted on its inner edge... (lifliiiis. 

 Terminal band dentate on its inner edge , marginalia. 



It may be noted here that the extreme Avestern forms, as a rule, 

 differ from the eastern species in the thinner, more scanty vestiture, 

 and shorter, more slender palpi. They have a i)eculiar shaggy aj)- 

 pearance, which is very characteristic. Some of the eastern forms 

 extend nearly to the Rocky Mountains, and retain their characters 

 quite constantly. None of the species of the^ section Hiemorrhugia 

 extend beyond the Rocky iNIountains, and the species are perhaps 

 best known. 



In the treatment of this genus, considering the scantiness of the 

 material at hand, I shall first give the descriptions, following Mr. 

 Grote's catalogue adding what notes I can, and will then add a 

 synoj)sis so far as I can make it u]) from the specimens at hand. 



It may be stated here that in " Can. Nat. and Geol." 1859, ]). 122, 

 Dr. Gibbs records the fact that Sesia thysbe emits a squeaking sound. 

 No one has since verified this observation. 



H. palpalis Grt., BiiflF. Bull, ii, 145. Hemnris : Edw., Pr. Cal. Ac. Sci. v, 89, 

 Ilemnris ; Butl., Trans. Zool. Soc. Lond. ix, 519, Hemnris. 

 Antennse black. Head above pale sulphur-yellow, palpi bright orange with 

 the tips black ; tongue black ; breast and sides of thorax beneath the wings pale 

 pulphnr-yellow. Thorax above, covered with olivaceous or rusty yellowish hair 

 extending over the dorsum of the abdomcTi. Abdomen black, with the pre-anal 

 segments tufted with light sulphur-yellow at the sides ; anal hairs black. LejiS 

 black. Witigs pellucid with narrow blackish -brown terminal borders, on the 

 primaries even, inwardly a little irregular towards internal angle. Allied to the 

 eastern H. tenuis and differing from all the species by the discolorous labial 

 palpi. No perceivable reddish apical stain. Expands 1.85 inches; 46 mm. 



ITa^.— Gilroy, Brit. Col. 



Of this species Mr. Edwards says (Pr. Cal. Ac. Sci. vi, 89) : "Its 

 chief difference from thetis seems to be in the darker shade of the 

 labial palpi." 



TRANS. AMER. KNT. SOC. XV. (12) MAY, 1888. 



