152 GEO. H. HORN, M. D. 



depressed. Sides of pro- and niesothorax very sparsely granulate, body be- 

 neath otherwise nearly smooth, a few punctures on the abdomen, more evi- 

 dent on the last two segments, tarsi with very short spines beneath. Outer 

 apical angle of anterior tibiae slightly prolonged. Length .50 inch; 12.5 mm. 

 (PI. Ill, fig. 9). 



This species seems more nearly allied to pnlita than any other but 

 differs from any in our fauna by its quite square thorax. 



Received from Fort Bayard, New Mexico, and placed in my cabinet 

 by Carl F. Gissler. 



AsiDA GtABBII Horn. — This name is proposed for a species from 

 Lower California, until now known as yihhicoUis. The name being 

 preoccupied at the time I gave it to this species a new one is required, 

 and I therefore dedicate it to the memory of my lamented friend who 

 collected this and many other varieties during a Geological exploration 

 of the Peninsula. 



HEL,OPS Fab. 

 The increase in the number of species as well as of specimens 

 requires some modification of a portion of this genus published by 

 me in 1870, (Trans. Amer. Philos. Soc. xiv, p. 392), more particularly 

 in the part containing the apterous species. 

 The new table is as follows : 



Antennae short, robust, outer joints compressed riigicollis Lee. 



Antennae longer than head and thorax 2. 



2. — Sides of thorax regularly arcuate or sinuate 3. 



Sides of thorax subangulate in front of middle 10. 



3. — Apex of thorax truncate 4. 



Apex of thorax emargiuate, anterior angles rather prominent 9. 



4.— Thorax longer than wide. Form slender attenuattlS Lee. 



Thorax usually wider than long, rarely equal 5. 



5. — Prothoracic pleura grooved or strigose fi. 



Prothoracic pleura coarsely punctured 7. 



6. — Hind angles of thorax obtuse or rounded. 



Hind angles rounded, pleural sculpture coarse consisting of large punc- 

 tures feebly confluent. Margin of thorax obtuse Bachei Lee. 



Hind angles obtuse or feebly subrectangular, the margin acute and 

 slightly reflexed; pleural sculpture finely, intricately strigose. 



couvexulus Lee. 

 Hind angles of thorax sharply rectangular. 



Elytra scarcely striate, with rows of fine punctures sereus Germ. 



Elytra rather deeply striate, the intervals convex. ...sulcipeiiuis Lee. 

 Elytra with rows of coarse, deep, slightly elongate punctures. 



perlbratas n. sp. 

 7.— Elytra with deep broad striae and coarse quadrate punctures. 



arizonensis Horn. 



Elytra finely or obsoletely striate 8. 



Elytra densely punctured, with feeble traces of striae (litticilis Horn. 



