PARASITISM OF GIPSY MOTH IN AMERICA. 141 
UNDETERMINED TACHINIDS. 
Dr. S. W. Williston, in reporting upon a collection of Diptera reared 
from the gipsy moth in Massachusetts and sent to him in 1891 by 
Dr. Fernald, stated that there were present two species of Exorista 
and four of Phorocera. Unfortunately these specimens appear to 
have been lost before being definitely determined. No such variety 
of tachinids has been reared from this host in Massachusetts during 
recent years, but several species as yet undetermined, or represented 
only by unfamiliar puparia, are in our collection. 
SUMMARY OF REARING WORK CARRIED ON AT THE LABORATORY IN 
1910. 
In Tables IV and V are the condensed results of a part of an 
extensive series of rearing experiments primarily instituted for the 
purpose of determining the present status of the introduced parasites 
of the gipsy moth in America in 1910. They also serve excellently 
as an indication of the effectiveness of parasitism by native species. 
In this respect they are typical of the results secured from similar 
work in previous years. 
TABLE 1V.—Results of rearing work in 1910 to determine progress of imported parasites 
and prevalence of parasitism by native parasites of gipsy-moth pup. 
Moths reared. Parasites reared. 
: pnd eer Scarco- 
aoe Localities. dispae Blepha- The- yg sibel phagid 
0. a ee silura aneous | puparia. 
pup. | Male. Female- “tollata, fulves- | concin- | tachi- 
: cens. nata. nids. 
2185 | North Andover...| 2,700 | 1,222 259 VE ACT SE glo | ee eeceed x meee Tn Be ge ae 
2186; | Melrose:.-. ==. <=. - 500 185 159 1G Keene as | [et eel Seat. Jr Eee Se erees 
2187 | North Andover.-..| 1,800 683 299 2 Spat shi-1) Gch [aan 2 
2188 | Stoneham........ 1, 400 482 AGT NS. 3228252 5 A ess os | eee 
2189) |) Saugus... 2- 1, 000 412 25 1 | eae ene 2 ya eee ome. 3 
2190 | Wakefield........ 800 126 DIRE ene Pte aes She be 3 Sale See ee 1 
2190A}...-.. COE a es 1106 4 38 ifs ee Pe LAR Ae ae le Se ce 
2191 | Swampscott...... 300 159 Sen ree eee ree ote ph rk es ele J ee 
21924} North Andover... 300 106 POs eer et rh Se ei Seen o's Soe 
2192B| Woburn.......... 282 69 PE witha ss sock 1 | See ees 2G) ee ce 
2192c | North Andover 100 67 OEMS We Bi OR Ae RRS a Re ae ep | eee a 
2103" ||| SAULUS* 222 22 Ss 1,050 274 17 2s (Ee een a! ees ape ? a Sp eens 1 
2194 | Melrose 2......... 1, 700 312 211 hat = Ra a Eas ee rs eae 1 
2196 | Stoneham........ 1, 047 379 Rn re ee ea ea Oe ete ne aN eee aL ck wckc we o 
2107+.) Beverly .. 3. 3.:2-- 1, 000 81 il a Raa ES ae a Sh A esl ene ce eo a 13 
ZAN)* el aia Corer Ses ee 1,000 147 fepltt~ sce. FR a i eee ee 5 
2280}, SAUSTIO 220-22 Sa 1, 250 253 PAO Sy oe 2 1 31 10 
2281 | North Andover... 580 2ag 18 WR ae Cane ee Pe nee eh Soe ee PR oa 
2.7229 C0 Se Soot 1,700 442 | 218 8 1 | an ay 6 
2283 | Beverly.....-.... 500 261 eo Rie ee Bie en aS tal ae 
792) a 1 ae ers 400 152 Saad att aps ae eee RS ol ee eS Pe ee a 
2285 | Gloucester........ 1, 700 354 Lot RRC ee hy ee es 52 | 5 
2286 | Beverly.......... 600 82 1] EEL Ge A yey Se, Se | 1 
Q28F fe: <2 COT ele 300 85 oN A AR See ee ay ne CE eS Se ee ee Oe 
2289 | North Andover 1, 000 143 pes a Th CoG Sees ‘SL Shies 
(ya oe eS Acs. 1, 100 118 es i ETS ER | 1 
2201 |..... aed) opi oe 900 198 71 eee | Me Oe) Se ee 2 
2293 | Beverly.......... 500 229 Octet Sates 2 Saat! | SS I 
Ph ad ee lo ae 500 81 TORS See: Seek Yn eae |e 2 
2295 | Middleton........ 1,100 193 al een etka ae eae eres? eee eee eee 
Tetaki...... 27,215 | 7,531 | 5.342 | 15 | 47 18 | 4 53 
1 Prepupe. 4 Erorista blanda. 
? Partly from another locality. 
5 Tachina-like species, puparium. 
5 One tachina-likeand one unknown native species, 
puparia. 
