CICINDELIDAE. 3 



natc, and a small seventh segment is tlins seen, Ijut in Amblyt-hila 

 the abdomen is alike in both sexes; the three anterior segments 

 are closely connate, the first is visible only on the sides, the 

 second is acute in the middle, and reaches the point of the 

 nietasternura; the others are movable. The dorsal segments, as 

 first observed by Dr. Sehaum, are eight in the male and seven in 

 the female, the seventh in the latter sex being elongated so as to 

 conceal the eighth. 



This family is divided by Lacordaire into five tribes, of '.vhich 

 but three are found witliin tlie limits of the United States, and 

 may be distinguished in the following manner: — 



Posterior coxse sejiarated ; eyes small. Manticorini. 

 Posterior coxae contiguous ; eyes large, prominent. 



Third joint of maxillary palj^i longer than the fourth. Megacephalini. 



Third joint of maxillary palpi shorter than the fourth. Cicindelini. 



Tribe I.— MEAIVTICORIIVI. 



The species of this tribe are apterous, with the elytra connate; 

 the eyes are small, and in tliis respect they differ from all other 

 members of the family; the first joint of the labial paljji is very 

 short, and hardly extends beyond the emarginatiou of the mentum. 



These insects are nocturnal in their habits. Dr. H. A. Brous 

 informs us that Amblychila is rarely to l)e seen until after sunset, 

 and not during cold or blustering nights ; during the day they 

 hide in holes, rai'ely under rubbish on the ground. Omus is found 

 during the day under any object affording suitable shelter. In 

 Amblychila the anterior tarsi of the male are not dilated, the 

 |)osterior trochanter is, however, acute at tip, and in the female 

 obtuse. In Omus the anterior tarsi of the male are widely 

 dilated, and the seventh ventral segment distinct. 



Two genera of this tribe occur in our country, and both are 

 peculiar to it. Amhhjchila having the sides of the elytra widely 

 inflexed, thorax scarcely mai-gined, and terminal joint of nmxillary 

 })al])i shorter than the third. It is represented by one species 

 found in Kansas, New Mexico, and Arizona. 



Omua has the elytra narrowly inflexed, thorax distinctly mar- 

 gined, and the last two joints of maxillary palpi subequal. Nine 

 species from California, Oregon, and Washington Territory have 

 thus far been described. 



