EUSTROPHUS. | 75 
Fam. MELANDRYIDZ. 
This is a family numerous in genera and species in the Palearctic and Nearctic 
Regions, and also in the temperate parts of the southern hemisphere. Comparatively 
few inhabit the tropics, either of the Old or of the New World. One species only 
has hitherto been described or noticed from Central America, whence we now record 
forty-one. A considerable number of genera (and a few species also) are common to the 
northern parts of Europe and North America, some of these also inhabiting Japan; and 
the general distribution of the majority of the genera of the Melandryide is more 
extended than in the other families of the Heteromerous Coleoptera. Polypria, Chevr., 
and several new genera here described are more or less intermediate between the 
Melandryide and the Pythide, and they are accordingly placed at the end of the 
family. 
In the Melandryide and the following families of the Heteromera to be treated in 
this work the anterior coxal cavities are widely open behind; in all the preceding 
groups or families, the Ischyomiides (which I am now inclined to place at the end of 
the Melandryide) and the Nilionide excepted, they are closed behind. 
The earlier stages of these insects are no dowbt passed in decaying timber or in the 
fungoid growths attached thereto. 
Group MELANDRYIDES. 
EUSTROPHUS. 
Eustrophus, Latreille, Régne anim. 1st ed. iii. p. 304 (1817); Lacordaire, Gen. Col. v. p.541; Horn, 
Trans. Am. Ent. Soc. xv. p. 82. 
This widely-distributed genus has one or more representatives in Europe, Japan, 
Madagascar, East Africa, and North America; three inhabit Central America. ustro- 
phus has recently been divided by Dr. Horn, certain of the rather numerous North- 
American species being referred to a new genus, Holostrophus; the latter is not repre- 
sented in our fauna. In one of the three species from Central America the mesosternum 
is distinctly keeled in front, though it is not longitudinally raised to the level of the 
prosternum, and received by it as in the following genus; all three have the prosternum 
narrowed behind, instead of being parallel between the cox and prolonged to meet 
the mesosternum as in Hustrophopsis. 
1. Eustrophus arizonensis. 
Eustrophus arizonensis, Horn, Trans. Am. Ent. Soc. xv. p. 34°. 
Hab. North America, Arizona and New Mexico!.— Mexico, Northern Sonora 
(Morrison), Jalapa (Hoge). 
The three examples received from Mexico agree closely with Dr. Horn’s description 
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