No. 22.] HYMENOPTERA OF CONNECTICUT. 685 



nal joints; lateral anterior margin of the clypeus bidentate; first 

 joint of the flagellum distinctly shorter than the second. Male: 

 interorbital line less than the length of the second and third 

 antennal joints ; first joint of the flagellum one third shorter than 

 the second. 



Found throughout the State and has been taken on flowers of 

 goldenrod and Erechtites hieracifolium, 



Tachytes Panzer. 

 The wasps belonging to this genus are often very handsome 

 with their silvery or golden markings on the black body. They 

 nest in sand and provision their nest with grasshoppers. For an 

 account of one species of this genus see " The Solitary Wasps," 

 p. 167. Mr. Fox in his revision of the species of this genus 

 divided them into two groups. All the species treated here 

 belong to the first group, which is characterized as follows: 

 " Fore coxse of male simple, the fore femora of the same sex, be- 

 neath at base, entire; thorax of female generally densely pubes- 

 cent. Appearance bee-like." 



Key to Species. ^ 



1. Females 2 



Males , 6 



2. Anterior margin of clypeus not produced into a lobe: ab- 



domen black with three dorsal silver bands; longer spur 

 of hind tibiae subequal with the hind basitarsi; front 



golden crassus 



Anterior margin of clypeus produced into a large quadrate 

 tooth (3 



3. Propodeum with a strong median sulcus, dorsally 4 



Propodeum with at most a faint median sulcus, dorsally. . 5 



4. Third joint of antennae subequal in length with fourth; front 



and thorax with silvery gray pubescence calcaratus 



Third antennal joint about one fourth longer than fourth; 

 dorsal aspect of propodeum granular; thorax with grayish 

 pubescence harpax 



5. Pygidium with a coppery lustre; scutellum scarcely im- 



pressed; sulcus of propodeum very wide mandibularis 



Pygidium silvery, scutellum distinctly impressed; sulcus of 

 propodeum narrow breviventris 



6. Basal joints of the flagellum not rounded out beneath; apical 



joints of antennae normal; apex of femora, the tibiae and 

 tarsi yellow-ferruginous crassus 



