NO. 1301. REVISIOX OF AMERICAN SimONAPTKRA— BAKER. 893 



occur on hind margin of head, though but a single rather stout l)ristle 

 occurs on disk of vertex back of antennal groove. The labial palpi 

 nearly equal the anterior femora. The maxillae are unusually slender. 



The prothoracic ctenidium contains a])out twenj^ spines. The 

 nietanotum and first three alxlominal tergites have four minute hut 

 stout dark-colored teeth on hind margins. The abdominal tergites 

 are provided with very numerous bristles in several rows, the prin- 

 cipal rows with about 20 to 24 bristles each, Antepygidial spines, 

 two on each side and of al)out equal length. Abdominal sternites 

 third to sixth inclusive, each with a row of about 12 larger bristles 

 and several smaller back of these; the seventh and eighth sternites 

 with numerous ])ristles in several somewhat scattered rows. Style 

 rather stout, with one long bristle at tip and with others nearly as 

 heavy along the sides. Substylar flap nearl}^ hidden in bristles. 



The hind coxa without minute teeth inside. Hind femui- witli a 

 straight row of about ten minute bristles on side. 1'here are 2 

 apical spines on joint II of hind tarsi, which nearly equal joints iii and 

 iv together. The spines on the last tarsal joints occur in the typical 

 Ceratophjdlus order. Lengths of hind tarsal joints in the proportions 

 of 21-12.5-8.5-5-9. 



Length, 2-3 mm. Color, light ])rown. 



CERATOPHYLLUS TUBERCULATUS, new species. 

 riateXIlI, figs. 7-9. 



Professor Aldrich has collected from CUellus cohnnhlanKx 'At Mos- 

 cow, Idaho, a species which is closel}" related to hit'siitu.s^ but which, 

 however, shows striking specific difi'erences. There are but two 

 speciuKnis — fortunatel}" male and female. 



Female: The head has the same strongly sloping upper margin as in 

 hirsutus, but the upper lip of the frontal notch projects as a conspic- 

 uous tubercle. The gena bears the usual three heav}'" bristles below, 

 with a small one between the first two, but the upper row is repre- 

 sented by onl}^ one, and that on the lower margin. Just above the 

 eye are a number of minute hairs. This species also has the hind 

 margin of the antennal groove provided with a number of minute 

 bristles, and one large bristle occurs on disk of vertex behind middle 

 of antennal groove. The gena below eye is acute posteriorly. The 

 dozen close-set ])ristles on second joint of antenna are longer than 

 third joint. The labial palpi extend to al)oiit thri>e-fourths of anterior 

 femora. 



Thoracic nota with two transverse rows of bristles, the principal 

 with about 10 good-sized firistles. The prothoracic ctenidium coti- 

 tains about 18 spines. The abdominal terga have about 1«) to IS large 

 bristles in the principal row. and with numerous mituite bristles in 

 two more or less well-defined rows back of these. The niiinite hairs 



