1854.] 177 



In the only species examined, the abdomen is six-jointed. On either side 

 there are five epimerals distinct, that of the 7th segment being wanting. 



tEgacylla Lecontii, D. Corpus laeve, nudum. Oculi fere conjuncti. Seg- 

 mentum abdominis ultimum paulo transversum ad basin latius, apice arcuato- 

 truncatum, nudum. Styli caudales abdomen vix superantes, elongate ciliati ; 

 rarao externo lanceolato, interno fere duplo latiore, subovato. Lon^. 6 2 l/// . 



The second joint of the superior antennae has a process at its apex nearly 

 as long as the following joint, and these antennae are shorter than the base of 

 the inferior antennae ; the rlagellum is about 7-jointed. The fiagellum of the 

 inferior pair is about 10-jointed. 



Spheroma oregonensis, P., Rep. Crust. Exp. Exp. p. 778, pi. 52, f. 4. 



4. Ampin' poda, 

 Orchestia Pickeringii, D., Rep. Crust. Exp. Exp. p. 882, pi. 59, f. 9. 



Orchestia Californiensis, D. Oculi majusculi. Antennae lmae perbreves ; 

 2dae crassae, dimidio corporis multo longiores, marginibus subtilissime setulosae; 

 flagello parce longiore quam articulum precedens, depresso, ferme 18 -articulato, 

 articulis non oblongis, partim transversis. Pes lmus articulo 4toangusto, infra 

 una spina, armato ; 5to angusto, breviore, processu parvo infra armato, apice 

 oblique truncato; ungui brevi, vix digitiformi. Manus 2da grandis, subovata, 

 infra palma subpxcavata, spinam versus apicem acutam gerente, digitosat longo. 

 Pedes sex postici spinulis brevibus multis ornati. Long. 1'" . 



The 7th pair of legs is but little longer than the 6th, and much longer than 

 the 5th. 



Allorchestes angustus, D. Epimerae perlatae, 4ta multo latiore quam 

 ionga, 5ta angusta subaeque bilobata. Pedes lmi debiles, manu paulo oblonga, 

 apice truncata, palma terminali bilobata, carpo subtriangulato. Manus se- 

 cunda, subovata, palma rectiuscula, inermi, narce pubescente ; carpus brevis, 

 processu tenui infra prolongatus. Pedes sequentes nudiusculi, marginibus articu- 

 lorum postici nudis, spinulis totis parvulis et reniotis. Long. AV". 



Owing to the broad epimerals, the animal is narrow with high sides. 



Additions to North American Ornithology, with description of new species of the 

 genera Actidurus, Podiceps and Podylymbus. 



By A.L. Heermann, M.D. 



Genus HYPOTRIORCHIS, Boie. 



Hypotriorchis attrantius, Gmel. Orange breasted Falcon. 

 Falco " Syst. Nat. vol. i. part. i. p. 283. 



Latham's Birds, vol. i. p. 289. 



i( femoralis, Tem'm. PI. col. vol. i. pi. 121 and 343. 



Male. Head, wings and back, light slate color; the primaries being of a 

 darker hue, and in their inner vanes barred with white, with which also the ter- 

 tiaries are tipped. A white line starting from above the eye extends down the 

 occiput, becoming rufous as it forms a collar on the hind neck. A deep slate 

 colored moustache descends from the angle of the mouth, one half inch on the 

 throat; auriculars of the same color. Chin, white. Breast, orange or yellow- 

 ish white, and in some specimens marked with elongated spots of black. Abdo- 

 men, thighs and under coverts of the tail, rufous. Sides and flanks, dusky black; 

 each feather being banded with delicate transverse white lines, and often uniting 

 so as to form a band in front, at the junction of the breast and abdomen. In 

 some specimens this band does not appear, as the dusky black feathers do not in 

 all cases extend across the abdomen. Tail, light gray slate color, is composed 

 of twelve faathers crossed by nine white bars; the ends of all these feathers 

 being tipped with white, except the two centre ones. Legs, yellow. Bill, yel- 

 low, tipped with bluish black. Length, 14 inches. 



