1916] Crampton — Maxilla oj the AcridiidcE 83^ 



Bright rufo- fulvous; tip of gaster light brown; clypeus, funiculus, 

 clypeus and borders of mandibles bro^'n. 



Glenwood Springs, Colo., altitude 5,750 feet (Cockerell). 



Superficially the ant resembles Pogonomyrmex occidentalis Cres- 

 son, but, as noted by Dr. Wheeler, the impressed thorax, shape of 

 petiole, vestigial sting and non-pectinated posterior tibial spurs 

 put it in the genus Messor. From the shape of the mandibles the 

 ant evidently stores seeds. This ant differs from the other species 

 of jNIessor in the fulvous red color and in having the peculiar apical 

 lobe on the mandibles. The antennal scapes are more dilated at 

 the base than in other species. 



A COMPARATIVE STUDY OF THE MAXILLAE OF THE 



ACRIDHD.E ((EDIPODIN^ AND TETTIGINiE), 



PHASMIDtE and PHYLLIID.E.i 



By G. C. Crampton. 



In attempting to determine the phylogeny and relationships of 

 the Orthoptera-like insects, it has seemed advisable to make a 

 comparative study of the various parts of the head (i. e., the trophi, 

 antennae, etc.), of the thorax {i. e., the sclerites, appendages, etc.), 

 and of the abdomen {i. e., the cerci, genitalia, etc.) ; and the present 

 paper dealing with four of the types of maxillte found in the Or- 

 thopteroid forms is offered as one of a series in which the trophi of 

 these insects are discussed, in addition to the various other struc- 

 tures mentioned above. Since no detailed descriptions or figures 

 of the maxillae of the Phylliidoe, Phasmidse, and Tettiginse have 

 been published (so far as I am aware), and since the general scheme 

 of the maxillary structure is practically the same in all Orthopteroid 

 insects, it has seemed preferable to begin the series of articles on 

 the trophi, etc., of the Orthoptera-like forms, with the description 

 of the maxillae of the above mentioned insects. 



The accompanying figures of the maxillae are necessarily some- 

 what diagrammatic, since certain structures shown in the figures 

 {e. g., the basal portions of the cardo, etc.) would not be completely 

 visible if sketched from the angle at which the remainder of the- 

 figure is drawn. Furthermore, lack of material preserved in al- 



1 Contribution from the Entomological Laboratory of the Massachusetts Agricultural College,. 

 Amherst, Mass, 



