258 Journal of Agricultural Research voi. iv. no. 3 



these apparently unrelated forms all as one species. Over 40 different 

 variations are at hand. The color names used are according to Ridg- 

 way's Color Standards.^ 



Material has been examined belonging to the United States National 

 Museum, the Porto Rican Sugar Growers' Association, the Porto Rico 

 Experiment Station, and the Imperial Agricultural Department of Bar- 

 bados. Over 250 specimens of this species are now at hand, and, in 

 order to show the trend of variation, the different forms are briefly 

 described. 

 Diaprepes spengleri marginatus Olivier. 



I. The impressions on the thorax are clad with flat white scales, which 

 also form the general color of the vestiture of the body, except for a pale 

 ocherous lateral vitta on the prothorax and elytra, and a trace of ocherous 

 near the scutellum on the elytra. The elytra are uniformly squamose, 

 with flat scales, without any denuded areas whatever. The material at 

 hand consists of four specimens from St. Croix, two collected by Mr. 

 Longfield Smith on cotton in May, 191 2, and two collected by Mr. V. 

 Hanchell on July 31, 1908. Size, 14 to 18 mm. This form is not 

 absolutely linked to the following. Except for the lack of denudations it 

 could not be readily distinguished from D. spengleri festivus (PI. XXXV, 

 fig. I). 



D. spengleri marginatus has been recorded by Fleutiaux and Salle on 

 Chrysobalanus icaco in Guadeloupe and was collected by Longfield 

 Smith on cotton. 



Diaprepes spengleri comma Boheman. 



2a. The impressions on the thorax are clad with iridescent light blue- 

 green and whitish scales, which also form the general color of the elytra 

 and undersides, except for a broad lateral vitta of empire yellow on the 

 elytra, and a touch of the same on each side of the scutellum. The 

 basal third of the fifth interval, the basal half of the ninth interval, and 

 the basal fourth of the tenth interval are denuded and shining black. 

 One specimen is at hand from Romana, Dominica, collected by Mr. W. V. 

 Tower on April 16, 1913. Size, 14 mm. 



26. The tendency in this variety is to increase the amount of the 

 denuded area. The majority of the specimens are less greenish and have 

 the basal half of the fifth interval, from one-half to three-fourths of the 

 ninth, and from one-fourth to one-half of the tenth denuded. The 

 lateral yellow vitta is distinct, but the yellow sutural spots are some- 

 times lacking. The material consists of one specimen from Dominica, 

 collected by Mr. H. W. Foote in June or July (Yale Expedition, 1913); 

 fourteen specimens from the Dominican Republic, collected by August 

 Busck in August; five specimens from Guanica, and one from Santa 

 Isabel, Porto Rico, collected by Messrs. E. G. Smyth and D. L- Van 



1 Ridgway, Robert. Color Standards and Color Nomenclature. 43 p., 53 col. pi. Washington, D. C, 

 1912. 



