CHARLES W. METZ. 121 



tions, and without a basal lobe produced by an invagination ; 

 and by the confluent, comparatively narrow upper extensions 

 of lateral face marks. 



The four species, with their varieties, included herein, 

 form the most compact, nearly related group in the genus, 

 but one in which the greatest range of variation is found 

 within a species. Apparently the entire division is composed 

 of offshoots from the modestus stock, for this species seems 

 to be breaking up into an endless number of forms. Thruout 

 the division the gradual evolution is apparent in genital, as 

 well as external characters, and consequently less emphasis 

 can be laid upon these in classification. 



PROSOPIS MODESTUS Say. 1837. 

 1837. Hylcsus modesUis, Say. Bos. Jour. Nat. Hist. 4:392. 

 1859. H modestus, LeConte. Writ. Thorn. Say. Ent. 2:771 

 1887. Prosopis modestus, Cr. Syn. Hymen. N. Amer., 1887, p. 291. 

 1890. P. modestus, Ashm. Bull. Colo. Biol. Assn. 1 : 31. 



1895. P. modestus, Rob. Tr. Am. Ent. Soc. 22 : 116. 

 ISm. P. modestus, Koh. Can. Ent. 28:136. 



1898. P. modestus, Ckll. Ent., 1898, p. 216. 

 1901. P. modestus, Lov. Ent. News. 12:5, 162. 

 IQOl. P modestus, Koh. Ent. News. 12:78. 

 1904. P. modestus, Rob. Can. Ent. 36 : 273. 

 1909. P. modestus, Lov. Ent. News. 20:413. 

 19\0. P. modestus, I.OV. Psyche. 17:182. 



Syn. P. sparsa Cr. 

 1869. P sparsa, Cr. Proc. Bos. Soc. Nat. Hist. 21:271. 

 1901. P. sparsa, Lov. Ent. News. 12:8. 



Syn. P. flaniDiipes Rob. 

 \%m. P.flammipes,^oh. Tr. Amer. Ent. Soc. 20:273. 

 \m\. P flammipes.\.OM. Ent. News. 12:7. 



Syn. P floridiana Rob. 

 1893. P.floridiatta, Rob. Tr. Amer. Ent. Soc. 20: 273. 

 IQOl. P floridiatia,L,ov. Ent. News. 12:7. 



Syn. P pemisylvanica Ckll. 

 \m%. P. pennsylvatiica, (ZYW. Psyche. 7:439. 

 1901. P. pen7isylva7iica, Lov. Ent. News. 12:8. 



Syn. P. citrinifrons Ckll. 



1896. P. citrinifrons, Ckll. Psyche Supp. 7 : 27. 

 1901. P citritiifrons, Lov. Ent. News. 12:8. 

 I'^O^. P. citrini/rotis,W\er. Can. Ent. 36:93. 



Syn. P. triangularis Ckll. 



TRANS. AM. ENT. SOC, XXXVII. (16) 



