On some Purafiitic Bees. .'^3 



Figs. 13 A and/. Two types of foldings of the wall of the prototheca — 

 h, seen in Calostylis ; j, common in early astr.eiform colonies, 

 e. g. HelioliteH, 



Fiy. 14. Diagram to show the overflow of the prototheca by soft parts 

 which bag all round down to the ground and form a new 

 fleshy foot. This secretes a pedestal which can fix the proto- 

 theca firmly to the substratum and doubles tlie thickness of 

 the protothecal ^v•all, This, it is suggested, should be called 

 the eutheca. 



Fiy. 15. Diagrammatic section of a Lithophyllia. Large wing- like septa 

 radiate out over the wall, and dissepiments are formed on 

 both sides of it; within the calicle they slope inwards, ou its 

 outer side they bend down aud thicken the column with 

 vesicular tissue between the costse. Mr. Quelch's genus 

 Moseleya is built on this plan, and cannot therefore be a 

 Cyathophyllid with prototheca modified on one of the simpler 

 plans shown in figs. 13 a-f. 



Fig. 16. A diagram to illustrate the principle of structure characterizing 

 the modern Astrieidas : 1 is the central parent calicle with 

 the prototheca moditied somewhat as in fig. 14 ; 2, 2 represent 

 buds from the lateral edges, the budding thus resulting in 

 the production of an astraeiforni colony. 



ir. — Some Parasitic Bees. By T. D. A. COCKERELL. 



Ccelioxifs rihisj var. Kincaidi, u. var. 



? . — Length 11-13 millim., the difference in size partly 

 dependent on the extension or retraction of the apical part of 

 the abdomen. 



Similar in all structural characters to C. ribis, but the 

 pubescence of the head and thorax is ochi'eous, the basal part 

 of the third abdominal segment is more sparsely punctured, 

 and the apical dorsal plate has the apex beyond the slight 

 lateral constriction a little more produced. There are distinct 

 and conspicuous transverse grooves across the middle of the 

 second and third abdominal segments, but not on the fourth 

 or fifth. Tibial spurs black. 



Hah. Olympia, Washington State, June 9 to 24, 1895, 

 June 2(), 1896, five females {T. Kincaid). 



This is the first Coelioxys recorded from the north-west. 

 It is quite different from rihis in appearance, but structurally 

 it is almost the same, having the same sculpture on the 

 penultimate ventral segment, &c. A male collected by 

 Mr. Kincaid at Olympia, June 18, 1895, is presumed to 

 belong to G. rihis Kincaidi, though the pubescence (especially 

 on the face) is white. This male almost exactly agrees with 



Ann. ds Mag. N. Hist. Ser. 7. Vol. xiii. '6 



