OF PSEUDOCOCCIDAE & ERIOCOCCIDAE 65 



of exclusive features justifying its isolation as a separate group. These exclusive 

 features concern chaetotaxy and the distribution of disc pores, namely : (1) dorsal 

 head setae 7 or less on each side ; (2) transverse band of ventral head setae include 

 5 or less setae on each side ; (3) few capitate, apically knobbed sensory setae present 

 on antennal segments III to X ; (4) abdominal disc pores present on segments I 

 and VIII only ; and (5) setae of the glandular pouch include a pair of comparatively 

 long tail-forming setae, two setae of medium, unequal lengths and a short one. 



The specializations of the group are : (1) the absence of disc pores on the head 

 and on abdominal segments II to VII ; (2) the strong development of the lateral 

 arms of the midcranial ridge ; and (3) the presence of interocular ridges. 



The primitive features are : (1) a large scutum, (2) strong basalare, and (3) long 

 setae of the glandular pouches. 



None of the previously studied species could be included in this group. 



IV. The Saccharicoccus group, which also comprises only one genus, Sacchari- 

 coccus. The species studied (S. sacchari) represents a rather primitive group with 

 the following exclusive characters : 



(1) The head and body dorso-ventrally flattened. 



(2) The ventral preocular depression entirely absent. 



(3) The postoccipital ridge V-shaped. 



(4) The postocular ridge dorsally reduced. 



(5) The prosternal ridge absent. 



(6) The antespiracular ventral setae more than one on each side. 



(7) The marginal ridge of the basisternum absent medially. 



(8) The furca reduced. 



(9) The legs comparatively short ; the body more than 2-2 times as long as 



the hind legs. 



The specializations of the group are : (1) the strong development of the lateral 

 arms of the midcranial ridge ; (2) the presence of interocular ridges ; and (3) the 

 reduction of the furca. 



The comparatively large number of primitive features include three exclusive 

 characters (4, 5, 7) and : (4) large scutum, (5) strong basalare, (6) long setae of 

 glandular pouches. 



No other species could be assigned to the Saccharicoccus group. 



V. The Pseudococcus group : Two genera, Pseudococcus and Dysmicoccus 

 represent this group and share 93 characters. The group is one of the two most 

 primitive among the material studied, and includes species with most characters in 

 the generalized pseudococcid condition. It shows only one exclusive, but rather 

 obvious character, i.e. the presence of fleshy setae on any part of the body itself 

 (head, thorax and abdomen), usually giving the species a rather hairy appearance. 

 The specializations of this group are : (1) lateral arms of midcranial ridge strongly 

 developed, (2) interocular ridge present. 



