738 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



6. Enclosure bordered by an impressed line, often obscured by 



the reticulations; tegulae rarely with a dot modestus 



Enclosure bordered by a raised line; tegulae often with a 

 yellow dot sayi 



Males. 



Fore coxae simple; propodeum rugose; at least the face, tarsi, 

 fore tibiae in front, and mid and hind tibiae at base, yel- 

 lowish. 



1. Abdomen black at base; body black; face marks entire; tu- 



bercles colored 2 



Abdomen reddish at base . • nelumbonis 



2. Lateral extension of face marks not ending near eye 3 



Lateral extension of face marks ending near eye; collar 



usually with two lines; length $-6 mm 4 



3. Lateral extension of face marks usually club-shaped, diverg- 



ing from eye; scape exteriorly and sometimes a dot on 



tegulae pale yellowish; length 4 mm pygmaeus 



Lateral extension of face marks hook-shaped, diverging from 

 eye; scape black; dot or mark on tegulae yellow . . . .verticalis 



4. Scape concave exteriorly; tegulae with a yellow spot 5 



Scape not concave exteriorly; tegulae and mandibles rarely 



yellow 6 



5. Edge of wing-base, labrum, mandibles more or less, often 



scape exteriorly yellow; face marks club-shaped laterally; 



yellow maculae at base and apex of mid tibiae, united ziziae 



Edge of wing-base, labrum, mandibles, and scape blackish, or 

 at least not yellow; face marks spear-shaped laterally; 

 yellow only at base of mid tibiae pennsylvanicus 



6. Mid and hind tibise with a blackish spot behind, hind ones 



often entirely yellow; first dorsal abdominal segment 

 impunctate; face marks sometimes club-shaped laterally; 



tegulae unspotted modestus 



Mid and hind tibiae yellow at base; first dorsal abdominal 

 segment impunctate; face marks pointed on eye margin; 

 tegulae sometimes spotted; wings hyaline sayi 



H. pygmaeus (Cresson). 



Occurs throughout the State in May, June, July, and August. 

 Collected at Stafford, Colebrook, New Haven, Branford, and 

 Sachem's Head, on flowers of goldenrod and red raspberry. 



H. ellipticus (CockereJl). 



On flowers of goldenrod. Stafford, 24 August, 1905 (W. E. 

 B.). 



