490 CALIFORNIA ACADEMY OF SCIENCES. 



In the typical Rmnbarii, a common species along the 

 eastern coast of the United States, the eighth abdominal 

 segment is blue, the ninth black; in crediihim " segment 

 8 entirely, 9 base only blue," both statements referring 

 to males and the black females. 



The above cited specimens are of variety credida ; 8 is 

 blue entirely or with a very narrow, transverse, basal, 

 black ring, articulation between 8 and 9 black; 9 blue 

 with an apical, dorsal, black spot occupying from one- 

 third to more than one-half the length of the segment on 

 the mid-dorsal line, but less on the sides — besides which 

 there is in some individuals a small, mid-dorsal, basal, 

 black spot, which may be united with the black at the 

 apex by a narrow, or even a broad, band. Two of the 

 black females have these basal and apical spots on 9 

 separated by a blue interval equal to one-fifth the length 

 of the segment, while the remaining black female has 

 these spots united by black. The orange females are 

 colored as in typical Ramhurii (having no black humeral 

 stripe, I and base of 2 orange — see Calvert /. c), the ex- 

 tent of the black on 2 is variable and on 10 varies from 

 nothing to the entire dorsum. That all are to be referred 

 to Ramhurii is shown by the fact that in other respects 

 and especially the superior appendages of the male, they 

 quite agree with the typical form. It is worthy of note 

 that the color of the superior appendages varies from yellow 

 in the male from Comondu, through brown to black in 

 typical Ramburii. The defiximi Hagen (not Selys) is the 

 same as this variety, see under /. -perfarva, -post. 



Distrihittion (var. credula). West Indies (Cuba, St. 

 Thomas, Jamaica by W. J. Fox), Bahamas (Crooked Is., 

 Nov. 24, 1890, by J. P. Moore and D. J. Bullock), Mex- 

 ico (Baja California as above), California. 



