150 THE ENTOMOLOGIST. 



place, has no white marks on abdomen, the nervures are partly 

 darkened (the marginal cell and border of stigma quite as in 

 hishoppi), and the apical plate of the abdomen is entirely as in 

 hishoppi. Yet the face-marks are white (the clypeus has two 

 blackish bars), the mandibles have the base wholly dark, and 

 the labrum is dark. The mesothorax is coloured exactly as in 

 bishoppi. 



The males have small lateral face-marks ; not at all the large 

 marks of P. vespertilio. They have not the white lines on the 

 abdomen. 



It is impossible to reach a perfectly satisfactory interpretation 

 of these Isopappm specimens, but they appear to be intergrades 

 (or hybrids ?) between bishoppi and ignota. 



Perdita cambarella, n. sp. 



$. Length about or a little over 4 mm. ; male 3^. The female, in 

 my table (Proc. Phila. Acad.), runs to P. chamccsarachcE, but differs 

 conspicuously from that by the much less shiny thorax ; the abdomen 

 is also a deeper shade of red. The clypeal marking somewhat recalls 

 P. asteris. The male shows some resemblance to P. vagans and 

 vespertilio. 



? . Head and thorax green, for the most part a rather yellowish 

 green, but the face strongly bluish green ; thorax above hairy, and 

 dullish ; mandibles with a large yellow basal patch ; face-markings 

 yellow (reddened by cyanide in type), confined to clypeus and lateral 

 marks ; clypeus with the upper lateral corners broadly dark, the yellow 

 sending a large pointed process upwards in the middle line, and a shght 

 projection at each side, reminding one of the rostrum of certain cray- 

 fishes [Cambarus); lateral face-marks triangular, the upper corner not 

 reaching level of antennae ; antenna dark above, yellow beneath ; pro- 

 thorax with two yellow marks on upper margin, and marks on 

 tubercles ; nervures and broad margin of stigma sepia-brown ; mar- 

 ginal cell normal, its post-stigmatal part about as long as substigmatal ; 

 third discoidal distinct ; anterior knees, and tibias in front, yellow ; 

 abdomen broad, bright deep apricot colour, without markings, except a 

 fine longitudinal black line on each extreme side of second segment ; 

 venter the same colour. 



3 . Smaller ; head and thorax bluer ; clypeus all light ; tarsi very 

 pale yellowish ; nervures colourless, but margin of stigma pale brown ; 

 abdomen suffused with dusky, so that it is brown rather than red, or 

 red with a broad dusky band on second segment only. 



Maxillary palpi 6-jointed ; labial palpi 4-jointed not especially 

 elongated ; first joint about 450 fx, second 120, third, 75, fourth 65 ; 

 claws of female simple, of male cleft. 



Hab. Paris, Texas, August 26th, 1905 ; at flowers of plant 

 not determined (the pollen collected is very light yellow, the 

 grains spherical) ; two of each sex (F. C. Bishopp). The name 

 P. cambarella has reference to the resemblance of the clypeal 

 marking of the female to the end of the rostrum of Cambarus. 

 The specimens were sent by Mr. J. C. Crawford. 



University of Colorado : March 15th, 1906. 



