1898.] ENTOMOLOGICAL NEWS. 115 



antenna and is in the form of a considerable opening covered by 

 a tight, drum-like disc. A series of sensory punctures is found 

 at the base of the second segment and just above the sensory 

 fovea there is an excavation which leaves that structure entirely 

 free. Joint 3 is peculiarly modified so that a considerable open- 

 ing appears between joints 2 and 3, the upper edge of joint 2 

 being ridged. This ridging is overshadowed by an expansion 

 of the third joint, and on the third, fourth and fifth segments 

 there are numerous sensory pittings. In the male the large 

 sensory fovea is present, but hardly as well developed as in the 

 female. There are no sensory punctures on the second segment, 

 and while the edge is ridged above, yet the third segment is not 

 modified in the same way as in the female. These points can 

 be brought out by comparing the figures already cited. It is 

 probable that this fovea is auditory in function. In the mouth- 

 parts there is little that is of especial interest. The labial palpi 

 are well developed in both sexes, though the labium is confined, 

 as usual, to a small triangular plate. The mandibles are well 

 developed, and are moveable, as shown at h for the female. The 

 maxillae differ quite strongly in the sexes at the base, and par- 

 ticularly is this true of the maxillary palpi. The female at i and 

 the male at j on plate illustrate these differences. In the female 

 the maxillary palpus is 2-jointed, the basal joint very large and 

 thick, the terminal joint of moderate size and much more slender. 

 In the male the palpus is 3-jointed, the basal joint comparatively 

 small, the second with a prominent lamellate expansion which is 

 clothed with rather long hair; the terminal joint is plate-like and 

 a little scoop-like in shape. Comparing the two, the maxilla in 

 the female is larger than that in the male and better developed, 

 which may be due perhaps to the fact that the female, as a whole, 

 is the larger insect of the two. No trace of lacinia is present in 

 the specimens, so far as I have examined them, but the well- 

 developed maxillary palpi and the division of the basal parts of 

 the maxilla assign a comparatively low place in the scale of de- 

 velopment to this insect. Further descriptive details seem un- 

 necessary and reference is made to the plate for a better under- 

 standing of the structures just referred to. 



Crabro salacis (Ckll.). 

 Syn. Ammoplanus saticis [Ckll., Ann. Mag. Nat. Hist., April, 1897, 



p. 402, $.— T. D. A. COCKERELL. 



