170 
Psyche 
[October 
Literature Cited. 
Casey , Thomas L. 1899. A Revision of the American Cocci- 
nellidse, Journ. New York Ent. Soc., VII, 138-160 
Crotch, G. R. 1874. Revision of the Coleoptera Family Cocci- 
nellidse, London 1-311 
Horn, G. H. 1895. Studies in Coccinellidse, Tran. American 
Ent. Soc., XXII, 81-114 
Leng, Charles W. 1920. Catalogue of the Coleoptera of America 
North of Mexico, 
Sharp, D. and Muir, F. 1912. The Comparative Anatomy of 
the Male Genital Tube in Coleoptera. Tran. Ent. Soc. 
London, 477-639 
Abbreviations 
BL Basal lobe 
BP Basal piece 
LL Lateral lobe 
ML Median lobe 
MS Median strut 
TG Tegmen 
Explanation of Plate VI. 
Fig. 1 Scymnus quadritceniatus Lee. 
Fig. 2 Scymnus americanus Muls. 
Fig. 3 Scymnus punctatus Mels. 
Fig. 4 Scymnus cervicalis Muls. 
Fig. 5 Scymnus terminatus Say 
Fig. 6 Scymnus nanus Lee. 
Fig. 7 Scymnus semiruber Lee. 
Fig. 8 Scymnus cinctus Lee. 
Fig. 9 Scymnus hcemorrhous Lee. 
Fig. 10 Scymnus pundicollis Lee. 
Fig. 11 Scymnus consobrinus Lee. 
Fig. 12 Scymnus tenebrosus Muls. 
