302 THE COCCIDAE 



there are two adjacent ones in each third or third and fourth in- 

 cisura. They are never as large as those of the Lepidosaphini 

 and their oraceratubae are generally shorter and more nearly cir- 

 cular in outline. The oraceratubae are generally located in lata- 

 dentes. The presence of latadentes seems to be quite constant 

 for all the species. 



The brevaceratubae are more prominent and more numerous 

 in many of the species of this tribe than in the species of other 

 tribes. In some species their oraceratubae are irregularly dis- 

 tributed over the dorsal surface while in others they are arranged 

 in crescentic or semicircular transverse rows. Where the breva- 

 ceratubae are arranged in rows, each row usually consists of a single 

 line of oraceratubae, but the row may consist of two or three 

 lines or of a number of oraceratubae irregularly arranged, 

 forming a broad band. The rows are always so far as observed 

 interrupted on the meson, forming right and left halves. The 

 halves of the rows in many species are also interrupted near the 

 middle of each lateral half so that each complete crescentic trans- 

 verse row is generally subdivided into four parts or groups. The 

 crescentic rows of oraceratubae are located on lines connecting 

 the median lobes, the second incisurae, the third incisurae, the 

 fourth incisurae, the fifth incisurae, and the cephalic margin of 

 the pygidium. The lines connecting the points named on the 

 two sides of the pygidium extend cephalad in each case around 

 the anus. Green has recognized six of these lines as present, 

 while Cooley identifies only five. Both Green and Cooley includ- 

 ing Morgan consider the lines of oraceratubae as indicating, at 

 least approximately, the lines of the suppressed segments of the 

 pygidium. These authors differ, however, somewhat as to the 

 way in which these lines should be traced. Green considers the 

 rows of oraceratubae as marking the posterior or caudal border 

 of the segment and it would seem as if there was evidence for 

 his conclusion. The lines or rows of oraceratubae are numbered 

 on each side, beginning at the meson, as the first, second, third, 

 fourth, fifth, and sixth rows. In order to be able to distinguish 

 between the two groups of each half row, the group near the 

 meson may be known as a mesal group, the anterior group of 

 Cooley, and the group near the margin of the pygidium as the 

 lateral group, the posterior group of Cooley. There are rarely 

 oraceratubae present in the first row. They are also of rare oc- 

 currence in the second row, if present, they are only represent- 

 ed by a mesal group or a lateral group. The other rows are gener- 



