34 ILLINOIS BIOLOGICAL MONOGRAPHS [42g 



with 209, C oscari) shows the umisual oblique bending of marking 

 which characterized the group noted above. This and oscari are how- 

 ever the only species in which it occurs and the group to which it 

 belongs is similar in pilosity to the Indian groups just described. This 

 particular one stands in closest relation to those shown in plate XII, 

 figures 170, llOa. and 171. It is introduced here because at the outer 

 margin its markings represent 2, 5, and 6 with the almost universal 

 central or fourth absent, except at the innerside where 4 seems to be 

 present and obliquely joined to 5. 241, a and b show a pattern in which 

 5 and 6 are present while 4 is wanting except for a few small dots. 

 This speciesi appears to show a tendency to double longitudinal lines. 

 243 shows a second African species in which there is a tendency to 

 double stripes but the central cross band represented at the margin. 

 The patterns show,, in fig\ires 244, 244ff, 245 and plate XIV are of 

 especial interest because the division of the second cross band in those 

 numbered 5 and 4 in the preceding figures are both represented as spots. 

 This is of rare occurrence, the more usual arrangement being like that 

 shown in figure 251. Figures 248 a and 6 show the double longitudinal 

 stripes of an African species, a ease similar to those illustrated above 

 in which one of the types of variation is in the direction of the spreading 

 of the white. Figures 247 and 247« show the joining of such markings 

 as occur in 246 and 259 to make a central longitudinal stripe. 



Figures 257 to 261, plate XIV, show unusual patterns of spots, 

 which fall into the usual cross bands on the whole, but those in the 

 inner margin of the elytron are usually shifted out of line. Figures 

 262 to 280 show various directions of reduction of markings in patterns 

 of the type shown in figures 266, 274 and 274o. Those at the left show 

 the loss of the central stripe and those to the right the loss of the inner 

 markings, entirely or in part. 281, 282, 283 show the extensions and 

 obliquity in the type pattern showm. 



Plate XVI, figures 292 to 306, show the American species in which 

 cross bauds 5 and 6 are separated as seen in 289, 294, 293, etc. The 

 general tendency is for the markings to disappear from the anterior to 

 the posterior end. 



The component parts of the oblique vitta of some species of the 

 Mexican group is illustrated by figures 311 to 313 and 319 and similar 

 components making a somewhat different vitta in 291, 296a, and 297. 

 Figures 315 to 328 show patterns in which the last or apical (7) cross 

 band is missing or in which variations arise in which it is reduced. 



Figures 329 to 355, plate XVI, show the species chiefly Eurasian, 

 a few American, in which bands 5 and 6 are present and separate, the 

 former illustrated by a marginal spot behind the center. Figure 347 

 shows a narrow longitudinal stripe extending forward from the spot 



