38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 52. 



On another, a specimen from Arizona, the maculations are better 

 developed than on the type; the spot inclosing the anterior ocellus 

 is united with the yellow on the frons below; the posterior orbits 

 extend in a broken line across the vertex; the prothorax except for 

 a median anterior dorsal spot is wholly yellow; there are lateral 

 yellow lines and a broken U-shaped discal mark on the scutum, a 

 fascia on the scutellum, another on metanotum, and a curved fascia 

 on dorsum of the median segment, which is extended on its posterior 

 surface; the lateral angles broadly and the entire sides of the median 

 segment, the mesopleurae, metapleurae, and the mesosternum are 

 wholly yellow; the paired median spots on dorsum of abdomen are 

 all united with the lateral spots and those on tergites 2 and 3 are 

 united medially, thus forming continuous, though deeply emargi- 

 nated, fasciae; and the black on the legs and sternites is much reduced. 



This species is characterized by a narrow head, the basally curved 

 middle metatarsi destitute of spines, the pair of tubercles on the 

 second ventral and the paired spots almost wliite in color on the 

 dorsum of the abdomen. This species stands close to ewMrginata, 

 from which it can be readily distinguished by its abdominal macula- 

 tions and by the fact that the second cubital cell is almost square. 

 In my judgment Fox erred in considering this species as the male of 

 tenuicornis, and my reasons for so thinking are stated in my dis- 

 cussion of that species. 



HahitaL—Cahforma, New Mexico, Arizona. 



Number of specimens examined — Males, 5; females, 1. 



Type.— Male, Cat. No. 19804, U.S.N.M. 



STICTIELLA EMARGINATA Cresson. 



Figs. 59, 60, 87, 105. 

 Iifonedula emarginata Cresson, Proc. Ent. Soc. Phila., vol. 4, p. 468, female and 



male. 

 Monedula mamillafa Handlirsch. Sitz. Akad. Wissensch. Wien, Math. -Nat. 



CI., vol. <J9, 1890, p. 146. 



Male. — Black: Labrum, mandibles except tips, clypeus, apical 

 part of frons, scape below, usually a very small spot before anterior 

 ocellus, broad anterior orbits, narrow posterior orbits, pair of trans- 

 verse spots on posterior border of pronotum, spot on tegulae, lateral 

 spots on scutellum, usually a narrow fascia on metanotum, rather 

 narrow fasciae on tergites 1-6, first usually reduced to \^^dely separ- 

 ated lateral spots, second sometimes narrowly interrupted medially 

 and widely and shallowly emarginate on anterior middle and some- 

 times prolonged forward on either side the emargination, third, 

 fourth, and fifth usually continuous and the anterior emargination 

 reduced to undulations, sixth usually broken into three spots, apex 

 of iiltimate tergite, lateral spots or continuous fasciae on sternites 

 2-5, fascia on 6, femora apically more or less, tibiae except frequently 

 spot below, and tarsi, yellow or yellowish white. 



