108 Mr. T. D. A. Cockerell — Descrijrtions and 



s.m. Legs bright ferruginous red, with the hind basitai'si 

 yellow, and the others suffusedly more or less yellowish ; 

 pulvilli distinct. Abdomen rather long, tapering, red, with 

 an angular yellow patch on each side of second segment, 

 the third to fifth segments nearly all yellow except in middle 

 and on extreme lateral margins, and a transverse red patch 

 or band on the middle of the yellow on each side; seventh 

 dorsal segment obtusely angular at sides, and in middle pro- 

 duced, into a very long bent finger-like process, the upper 

 side of which is keeled ; second ventral segment raised and 

 angulate in middle of apical margin. 



Hab. Federal District, Mexico (J. R. Inda, 21). U.S. 

 National Museum. 



A very distinct and remarkable species, kindly placed in 

 my hands for description by Mr. J. C. Crawford. I know 

 of no close relative ; on account of the structure of the 

 seventh abdominal segment it forms a section by itself. 



Dianthidium bivittatum (Cresson). 



Cresson described this in 1878 from two males collected 

 in Mexico. The female, hitherto unknown, has been found 

 at Livingston, Guatemala, May 11, by Messrs. Barber and 

 Schwarz. It is like the male, but has the following special 

 characters : clypeus black, its lower margin bidentate ; hair 

 of vertex and mesothorax all ochreous ; mandibles massive, 

 with a very long and oblique quadridentate inner edge, a 

 large yellow spot on outer surface near base ; yellow face- 

 marks consisting of two bars, divergent above, between 

 antennse, and narrow stripes along the whole length of the 

 inner orbits ; yellow stripe of cheeks and occiput interrupted, 

 at level of top of eyes, and again (broadly) in middle ; middle 

 femora with a yellow band beneath and hind ones with a 

 spot near apex ; first two abdominal segments black with 

 shining pile, the others mainly orange, the sixth broadly 

 black apically ; ventral scopa thin and short, glittering pure 

 white. 1). nectarinioides (Schrottky) is an allied South 

 American species. 



These insects curiously resemble certain Eumenid wasps. 



Dianthidium (Anlhidiellam) eiseni, sp. n. 



g . — Like D. notatum (Latr.), but the markings cream- 

 colour ; femora black with the knees reddish ; dark parts of 

 tibiae reddish black, but anterior tibiae light ferruginous in 

 front ; lateral face-marks hardly going above level of antennae ; 



