374 HETEROMERA. 
1. Nemognatha ceruleipennis. (Tab. XVII. fig. 7, var. y.) 
Nemognatha ceruleipennis, Perty, Del. anim. artic. Brasil. p. 67, t. 13. fig. 15 (1830)*; Casteln. 
Hist. Nat. Ins. Col. ii. p. 280°. 
Nemognatha versicolor, Chevr. Col. Mex., Cent. i. fase. 4, no. 60 (1834)*; Dugés, La Naturaleza, 
i. p. 167, t. 2. fig. 12*; An. Mus. Michoacano, ii. p. 110 dis’. 
Var. a. The abdomen reddish-testaceous. 
Var. (3. The under surface, the femora entirely or in part, and the extreme base of the tibie also in some 
specimens, reddish-testaceous. 
Var. y. The head, prothorax, under surface, and legs piceous or black. (Fig. 7.) 
Nemognatha bicolor, Luc. in Casteln. Exped. dans  Amér. du Sud, Entom. p. 148° (nec Lec., nec 
Walk.). 
Nemognatha lucasi, Gemm. & Harold, Col. Hefte, vi. p. 124. 
Var. 5. As in y, but with the abdomen, and sometimes the trochanters also, reddish-testaceous. 
Nemognatha abdominalis, Luc. loc. cit.’ 
Hab. Mexico, Tierra Colorada and Venta de Zopilote, both in Guerrero (H. H. Smith), 
Matamoros Izucar (Sa//é), environs of the city of Mexico *® (Hége), Michoacan °, Sierra 
de Mazamitla* (Dugés); GuatEmata, San Gerénimo, El Jicaro (Champion).—Sovutu 
AMERICA, Cayenne *, Upper Amazons, Peru, Brazil !. 
The different forms of this species occur together, upon flowers on the open savanas, 
in various places in Mexico, in Guatemala, and in South America. The head, thorax, 
under surface, and legs vary in colour from black to reddish-testaceous; the elytra are 
violaceous or ceruleous, metallic. The varieties with the head and thorax black (y and 6) 
occur commonly at Matamoros Izucar; but they are not mentioned by Chevrolat or 
Dugés. Numerous South-American examples of the forms described by Lucas under 
the names of NV. bicolor and NV. abdominalis are before me; they do not differ in any 
way from those from Central America. In the male of WN. ceruleipennis the fifth 
ventral segment is unimpressed, and the sixth is cleft down the middle and broadly 
excavate in the centre. The head in the male is broader and has the vertex more 
tumid than in the female. | 
2. Nemognatha lurida. 
Nemognatha lurida, Lec. Proc. Acad. Phil. vi. p. 8345*; Trans. Am. Ent. Soc. viii. p. 212’. 
Nemognatha decipiens, Lec. Proc. Acad. Phil. vi. p. 347°. 
Nemognatha rufa, Dugés, An. Mus. Michoacano, ii. p. 111 dis *. 
Hab. Nortu America, Missouri!, Kansas ?, Colorado 2, Oregon 2 °, Texas ! 2, Arizona ?. 
—Mexico, Northern Sonora (Morrison), Monclova in Coahuila (Dr. Palmer), Villa Lerdo 
in Durango (Hége*). | | 
From each of the Mexican localities quoted we have received numerous examples, 
and these agree perfectly with others from Texas. The colour is variable, the elytra 
being often entirely black, piceous, or brown. All the specimens from Sonora have 
