30 PROCEEDINGS OF THE ACADEMY OF [Jan.^ 



unserrated. The fifth segment has a row of minute chitinous teeth 

 extending transversely across the ventral side between the fifth feet. 

 This same segment has on its lateral sides a row of fine spinules as 

 well as a minute fringe of hairs, as in C. prasinus. 



The abdomen tapers but little towards its posterior end. The 

 first segment is about as long as the three following ones. The pos- 

 terior edges of the first three abdominal segments are smooth. 

 Occasionally there are very slight and uneven serrations present 

 (PL I, fig. 3). The ventral posterior border of the fourth segment 

 has a prominent fringe of spines which do not extend to the edge of 

 the anal opening, as is the case in C. alhidus. I find no mention of 

 this characteristic in any descriptions of C. fuscus that I have at hand. 



The stylets (PI. I, fig. 3) are short; the branches often slightly 

 out-curved. The length is three times the width. Schmeil states 

 that the inner border is ''densely" set with hairs. In the specimens 

 from this locality these hairs are often very irregular, rarely "dense," 

 but always present. The apical setae are well developed and densely 

 plumose. The outer is to the inner as 4 : 7. The longest is to the 

 next in length as 7 : 5. 



The first antennae of the female (PI. I, figs. 1 and 9) reach to the 

 anterior border of the first abdominal segment. They are seventeen- 

 jointed and bear a minute sensory hair upon the twelfth segment 

 in place of the sense-club found in C. alhidus (PI. I, fig. 9). On 

 their anterior edges at the point of juncture with the following seg- 

 ments, the eighth, ninth, tenth, twelfth, thirteenth, and fourteenth 

 segments are ornamented with a row of prominent, obliquely set 

 spinules. These rows of spinules form almost a quarter circle on 

 the eighth, ninth, and tenth segments. On the twelfth and thirteenth 

 segments they are not so closely set and are fewer in number. It is 

 interesting to note that where Schmeil found six spinules on these 

 segments in European forms, I have found but four or five, and on 

 the fourteenth segment where he records four, I have noted five in 

 every case. I have never seen more than seven of these spinules 

 on the eighth, ninth and tenth segments, and the eighth and tenth 

 usually have but five. Besides these regular rows of spinules, there 

 are smaller transverse and longitudinal rows and irregular groups Of 

 very minute spinules (PI. I, fig. 9) on the ventral side of the first 

 fourteen antennal segments. The longitudinal rows mark the 

 boundary between the smooth portion of the segment and that on 

 which the spinules occur. 



The three terminal segments bear transparent hyaline plates. 



