74 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



between the cephalic setae of the anal ring. The caudal pair 

 of sets are separated from the cephalic pair liy a space equal 

 to one-half the distance between the caudal pair of setae. The 

 setae of the caudal pair are slightly farther apart than are the 

 setae of the cephalic pair. Lines drawn longitudinally through 

 the corresponding right and left setae of each pair would form 

 a much elongated inverted "V". 



These setae are believed to be good specific characters. How- 

 ever, their usefialness as specific characters will j^robably be 

 v^ery limited liecause of the difficulty of making mounts which 

 will show them in their proper relations. 



CER ART— (Figs. 6-17) 



The term cerari is synonymous with filuri (Berlese). A 

 cerari is composed of one or more conical setae surrounded by 

 a group of wax pores. A conical seta, figs. 6-7, is easily dis- 

 tingaiished from the ordinary setae covering the body. They 

 are broader across the base and distinctly cone-shaped. Dif- 

 ferent proportioned conical setae are found in different species, 

 the relation of the width of the base to the length being a 

 specific variation. The wax pores of the cerari are of the 

 usual triangular type covering the body. The cerari occur 

 slightly dorsad of the margin of the body. There are seventeen 

 pairs in each of the species studied. The number of cerari for 

 each body segment was studied, but no definite conclusions 

 reached. Berlese in his study of lo)igispinus Targ. assigns five 

 cerari to the head, one to the prothorax, two to the mesothorax, 

 two to the metathorax and one each for the seven abdominal seg- 

 ments. To solve definitely this problem the segmentation will 

 have to be followed from the first nymphal stage. 



The number of conical setae and the grouping and number of 

 the wax i^ores is a fairly constant specific character. There is a 

 marked specific variation which, however, is well within the 

 limits of the generic variation. 



So far as known to the writer, the cerari have never been used 

 in taxonomy or mentioned in descriptions of species of the sub- 

 family Eriococcinae. The following is a description of the cerari 



