No. 22.'] HYMENOPTERA OF CONNECTICUT. 165 



S. zabriskiei Ashmead. Howard, Insect Book, PL xii, Fig. 

 12. Larva feeds on purslane. Westville, 20 June, 1905 (W. 

 E. B.) ; New Haven, 26 June, 1905, 3, 8 September, 1910, 6 

 August, 1911 (W. E. B., H. L. V., B. H. W.) ; Hamden, 24 

 July, 1910 (B. H. W.) ; Branford, 30 June, 1911 (W. E. B.). 



AcORDULECERINyE. 



Acordulecera Say. ^ 



Key to Species. 



1. Pronotum entirely white or luteous 2 



Pronotum either wholly black or piceous, the collar a narrow, 



pale margin 7 



2. Mesothorax luteous with black markings 3 



Mesothorax black 6 



3. Front impressed about median ocellus, producing a more or 



less distinct pentagonal area; median fovea triangular and 

 distinct; head black, antennae fuscous; clypeus, labrum, 

 mandibles, thorax except a spot on each lobe and apex 

 of scutellum, legs, and abdomen, luteous; wings hyaline, 

 costa, veins, and stigma luteous; saw-guides retracted. 



Length 5 mm media 



Front not impressed about median ocellus; median fovea 

 wanting 4 



4. Antennae wholly black 5 



Antennae with the two basal segments white; clypeus, labrum, 



and mandibles, white, remainder of head black; remain- 

 der of body luteous, except a black spot on each lobe 

 of mesonotum and the scutellum; wings hyaline; third seg- 

 ment of antennae but little longer than fourth; saw-guides 

 retracted. Length 4-5 mm biclinia 



5. Front with short, fine pubescence, so that head appears 



glossy black; pubescence of antennae black, antennae black; 

 head black, with labrum, clypeus, and mandibles white; 

 thorax, except scutellum and a spot on each lobe of meso- 

 notum, legs and abdomen luteous; saw-guides exserted, and 

 broadly, roundly truncated at apex; third segment of an- 

 tennae about as long as the fourth and fifth together. 



Length 4 mm minima 



Front with long pubescence which conceals glossy black of 

 head and gives it a hoary appearance; antennae black, with 

 white hairs; head black, with labrum and mandibles 

 white; prothorax luteous; mesonotum and scutellum black; 

 pleurae and pectus piceous; legs and abdomen luteous; 

 wings hyaline; saw-guides retracted; third segment of an- 



