72 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



of setae is nearer the median pair than is the caudal pair. The 

 outer circle of pores is limited anteriorly by the cephalic setae. 

 This row extends several pores caudad of the posterior setae. 

 The row is double between the median and caudal setae for most 

 of the distance. In the inner circle the number of denticulate 

 pores is irregular. One denticulate pore on each side indents 

 the membrane of the orifice at the caudal setae. Posteriorly 

 from the caudad setae the circle continues as a single or double 

 row of pores. The anterior concavity is broad and marked and 

 is composed of a single row of cells. 



In the above description the close adherence to the generic 

 type of the ring is noticeable. The specific variation is small, 

 but remarkably constant for the several specimens of each 

 species examined. It is doubtful, however, whether the anal 

 ring will be useful in specific determinations because of the 

 difficulty of making satisfactory mounts. Its usefulness as a 

 generic character appears to be very striking, as it differs 

 greatly from the anal ring of other genera as Orthezia, Ripersia 

 and Pluto. 



POSTANAL SET.E— (Figs. 1-5) 



Ventrad of the anal ring and at varying specific distances 

 from it are two pair of setae. These setae have in each case 

 been compared in a number of specimens and their size and 

 arrangement is apparently subject to little variation. Follow- 

 ing is a discussion of these setae. 



Longispinus Targ. — (Fig. 5). The cephalic pair* of setae is 

 separated by a space equal to the diameter of a seta of the anal 

 ring from the caudal horns of the inner circle of wax pores. 

 The setae of this pair are separated by the width of the orifice. 

 The posterior pair of setae are separated from the anterior pair 

 by a distance equaling three-fourths the distance of the anterior 

 pair of setjp from the caudal pair of anal setae. The sets of 

 the posterior pair are slightly nearer together than are the 

 setae of the anterior pair. Lines drawn longitudinally through 



*For convenience in the discussion the pair of setae nearest the anal ring is called 

 the cephalic pair of seta", tlie other pair then would he the caudal pair of setae. 



