CUIICULIONIDAE. 480 



9. Claws simple, divergent. Ki. 



Claws ai)poudiculate, divergent. Phyrdenus. 



10. Ventral segments 2-4 equal, sutures straight. Cryptorhyuchus. 

 iSecoud ventral segment longer than 3d ur 4tii ; Isl suture cuived. 



Macromerus. 



11. Tibias not serrate. i2. 

 Tibiae more or less serrate. Zascelis. 



12. First ventral suture deep. Ccelosternus. 

 First ventral suture sinuate, faint at the middle. Baropsis. 



Micromastus, one Tyloderma, Zuscelis, uiid Ccelostenms, from 

 Califoruia, with one species of Acallos in Arizona, are tlie only 

 representatives on the Pacific slope of this large group. The 

 others occur iu the interior district, Texas, and the Atlantic 

 States. 



Tribe XVII.— ZYGOPINI. 



The form of these insects is quite peculiar ; the body is elon- 

 gate, subrhomboidal, the first and second ventral segments long, 

 tlie remaining ones short, rarely horizontal, as in the preceding 

 genera, but forming an obliquely ascending surface. The pygi- 

 dium is concealed by the elytra in our species, but is visible ia 

 some foreign genera. Tlio eyes are large, and not concealed, 

 even when the head is deflexed; they are closely approximate on 

 the front, but widely distant beneath and 6nely granulated. The 

 beak is long and slender, only slightly curved, and is received in 

 a deep prosternal canal, wiiich in some species does not extend 

 upon the mesosternum, so that the end of the beak is free, as in 

 Conotrachelus ; even when, as in others, the mesosternum is ex- 

 cavated, the canal is open and not sharply limited behind. Legs 

 slender, front coxae elongated, and prolonged into a point on the 

 inner side, claws simple, divm-gent. 



Our species are of small size, and represent four genera: — 



I'ygidiuin covered by the elytra. '■!•■ 



Pygidium exposed. Zygops. 



2. Mesosternum declivous. ■^• 

 Mesosternum excavated. Piazurus. 



3. Ventral surface obliquely ascending.' Coptiirns. 

 Ventral surface nearly horizontal, Acoptus. 



Zygops is represented by one species in Arizona, probably the 

 same as some Mexican species. The ulher genera occur on both 

 sides of the continent. 



